USA: Illinois
Counties
The population of all counties in Illinois by census years.
| Name | Status | Population Census 1990-04-01 | Population Census 2000-04-01 | Population Census 2010-04-01 | Population Census 2020-04-01 | |
|---|---|---|---|---|---|---|
| Adams | County | 66,090 | 68,277 | 67,103 | 65,729 | → |
| Alexander | County | 10,626 | 9,590 | 8,238 | 5,239 | → |
| Bond | County | 14,991 | 17,633 | 17,768 | 16,725 | → |
| Boone | County | 30,806 | 41,786 | 54,165 | 53,451 | → |
| Brown | County | 5,836 | 6,950 | 6,937 | 6,240 | → |
| Bureau | County | 35,688 | 35,503 | 34,978 | 33,243 | → |
| Calhoun | County | 5,322 | 5,084 | 5,089 | 4,438 | → |
| Carroll | County | 16,805 | 16,674 | 15,387 | 15,707 | → |
| Cass | County | 13,437 | 13,695 | 13,642 | 13,049 | → |
| Champaign | County | 173,025 | 179,669 | 201,081 | 205,873 | → |
| Christian | County | 34,418 | 35,372 | 34,800 | 34,039 | → |
| Clark | County | 15,921 | 17,008 | 16,335 | 15,463 | → |
| Clay | County | 14,460 | 14,560 | 13,815 | 13,289 | → |
| Clinton | County | 33,944 | 35,535 | 37,762 | 36,893 | → |
| Coles | County | 51,644 | 53,196 | 53,873 | 46,864 | → |
| Cook | County | 5,105,067 | 5,376,741 | 5,194,675 | 5,275,555 | → |
| Crawford | County | 19,464 | 20,452 | 19,817 | 18,674 | → |
| Cumberland | County | 10,670 | 11,253 | 11,048 | 10,453 | → |
| De Witt (DeWitt) | County | 16,516 | 16,798 | 16,561 | 15,520 | → |
| DeKalb | County | 77,932 | 88,969 | 105,160 | 100,422 | → |
| Douglas | County | 19,464 | 19,922 | 19,980 | 19,736 | → |
| DuPage | County | 781,666 | 904,161 | 916,924 | 932,884 | → |
| Edgar | County | 19,595 | 19,704 | 18,576 | 16,856 | → |
| Edwards | County | 7,440 | 6,971 | 6,721 | 6,245 | → |
| Effingham | County | 31,704 | 34,264 | 34,242 | 34,676 | → |
| Fayette | County | 20,893 | 21,802 | 22,140 | 21,498 | → |
| Ford | County | 14,275 | 14,241 | 14,081 | 13,526 | → |
| Franklin | County | 40,319 | 39,018 | 39,561 | 37,803 | → |
| Fulton | County | 38,080 | 38,250 | 37,069 | 33,608 | → |
| Gallatin | County | 6,909 | 6,445 | 5,589 | 4,944 | → |
| Greene | County | 15,317 | 14,761 | 13,886 | 11,987 | → |
| Grundy | County | 32,337 | 37,535 | 50,063 | 52,539 | → |
| Hamilton | County | 8,499 | 8,621 | 8,457 | 7,996 | → |
| Hancock | County | 21,373 | 20,121 | 19,104 | 17,613 | → |
| Hardin | County | 5,189 | 4,800 | 4,320 | 3,647 | → |
| Henderson | County | 8,096 | 8,213 | 7,331 | 6,385 | → |
| Henry | County | 51,159 | 51,020 | 50,486 | 49,282 | → |
| Iroquois | County | 30,787 | 31,334 | 29,718 | 27,082 | → |
| Jackson | County | 61,067 | 59,612 | 60,218 | 52,966 | → |
| Jasper | County | 10,609 | 10,117 | 9,698 | 9,287 | → |
| Jefferson | County | 37,020 | 40,045 | 38,827 | 37,110 | → |
| Jersey | County | 20,539 | 21,668 | 22,985 | 21,518 | → |
| Jo Daviess | County | 21,821 | 22,289 | 22,678 | 22,043 | → |
| Johnson | County | 11,347 | 12,878 | 12,582 | 13,304 | → |
| Kane | County | 317,471 | 404,119 | 515,269 | 516,516 | → |
| Kankakee | County | 96,255 | 103,833 | 113,449 | 107,510 | → |
| Kendall | County | 39,413 | 54,544 | 114,736 | 131,868 | → |
| Knox | County | 56,393 | 55,836 | 52,919 | 49,958 | → |
| La Salle | County | 106,913 | 111,509 | 113,924 | 109,650 | → |
| Lake | County | 516,418 | 644,356 | 703,462 | 714,336 | → |
| Lawrence | County | 15,972 | 15,452 | 16,833 | 15,292 | → |
| Lee | County | 34,392 | 36,062 | 36,031 | 34,151 | → |
| Livingston | County | 39,301 | 39,678 | 38,950 | 35,827 | → |
| Logan | County | 30,798 | 31,183 | 30,305 | 27,995 | → |
| Macon | County | 117,206 | 114,706 | 110,768 | 103,984 | → |
| Macoupin | County | 47,679 | 49,019 | 47,765 | 44,973 | → |
| Madison | County | 249,238 | 258,941 | 269,282 | 265,868 | → |
| Marion | County | 41,561 | 41,691 | 39,437 | 37,736 | → |
| Marshall | County | 12,846 | 13,180 | 12,640 | 11,752 | → |
| Mason | County | 16,269 | 16,038 | 14,666 | 13,091 | → |
| Massac | County | 14,752 | 15,161 | 15,429 | 14,170 | → |
| McDonough | County | 35,244 | 32,913 | 32,612 | 27,232 | → |
| McHenry | County | 183,241 | 260,077 | 308,760 | 310,213 | → |
| McLean | County | 129,180 | 150,433 | 169,572 | 170,956 | → |
| Menard | County | 11,164 | 12,486 | 12,705 | 12,295 | → |
| Mercer | County | 17,290 | 16,957 | 16,434 | 15,698 | → |
| Monroe | County | 22,422 | 27,619 | 32,957 | 34,953 | → |
| Montgomery | County | 30,728 | 30,652 | 30,104 | 28,283 | → |
| Morgan | County | 36,397 | 36,616 | 35,547 | 32,920 | → |
| Moultrie | County | 13,930 | 14,287 | 14,846 | 14,527 | → |
| Ogle | County | 45,957 | 51,032 | 53,497 | 51,780 | → |
| Peoria | County | 182,827 | 183,433 | 186,494 | 181,836 | → |
| Perry | County | 21,412 | 23,094 | 22,350 | 20,941 | → |
| Piatt | County | 15,548 | 16,365 | 16,729 | 16,676 | → |
| Pike | County | 17,577 | 17,384 | 16,430 | 14,734 | → |
| Pope | County | 4,373 | 4,413 | 4,470 | 3,764 | → |
| Pulaski | County | 7,523 | 7,348 | 6,161 | 5,190 | → |
| Putnam | County | 5,730 | 6,086 | 6,006 | 5,636 | → |
| Randolph | County | 34,583 | 33,893 | 33,476 | 30,164 | → |
| Richland | County | 16,545 | 16,149 | 16,233 | 15,811 | → |
| Rock Island | County | 148,723 | 149,374 | 147,546 | 144,667 | → |
| Saline | County | 26,551 | 26,733 | 24,913 | 23,772 | → |
| Sangamon | County | 178,386 | 188,951 | 197,465 | 196,341 | → |
| Schuyler | County | 7,498 | 7,189 | 7,544 | 6,899 | → |
| Scott | County | 5,644 | 5,537 | 5,355 | 4,947 | → |
| Shelby | County | 22,261 | 22,893 | 22,363 | 20,990 | → |
| St. Clair | County | 262,852 | 256,082 | 270,056 | 257,412 | → |
| Stark | County | 6,534 | 6,332 | 5,994 | 5,395 | → |
| Stephenson | County | 48,052 | 48,979 | 47,711 | 44,631 | → |
| Tazewell | County | 123,692 | 128,485 | 135,394 | 131,341 | → |
| Union | County | 17,619 | 18,293 | 17,808 | 17,239 | → |
| Vermilion | County | 88,257 | 83,919 | 81,625 | 74,204 | → |
| Wabash | County | 13,111 | 12,937 | 11,947 | 11,362 | → |
| Warren | County | 19,181 | 18,735 | 17,707 | 16,833 | → |
| Washington | County | 14,965 | 15,148 | 14,716 | 13,758 | → |
| Wayne | County | 17,241 | 17,151 | 16,760 | 16,173 | → |
| White | County | 16,522 | 15,371 | 14,665 | 13,872 | → |
| Whiteside | County | 60,186 | 60,653 | 58,498 | 55,694 | → |
| Will | County | 357,313 | 502,266 | 677,560 | 697,298 | → |
| Williamson | County | 57,733 | 61,296 | 66,357 | 67,152 | → |
| Winnebago | County | 252,913 | 278,418 | 295,266 | 285,337 | → |
| Woodford | County | 32,653 | 35,469 | 38,664 | 38,465 | → |
| Illinois | State | 11,430,602 | 12,419,293 | 12,830,632 | 12,813,469 |
Contents: Places
The population of all places in Illinois by census years.
| Name | Status | County | Population Census 1990-04-01 | Population Census 2000-04-01 | Population Census 2010-04-01 | Population Census 2020-04-01 | |
|---|---|---|---|---|---|---|---|
| Abingdon | City | Knox | 3,670 | 3,567 | 3,288 | 2,958 | → |
| Adair | Census-Designated Place | McDonough | 171 | 164 | 210 | 212 | → |
| Adams | Census-Designated Place | Adams | 65 | 57 | 64 | 75 | → |
| Addieville | Village | Washington | 258 | 267 | 252 | 258 | → |
| Addison | Village | DuPage | 33,100 | 36,084 | 37,084 | 35,696 | → |
| Adeline | Village | Ogle | 145 | 139 | 87 | 76 | → |
| Albany | Village | Whiteside | 837 | 896 | 903 | 863 | → |
| Albers | Village | Clinton | 684 | 896 | 1,174 | 1,135 | → |
| Albion | City | Edwards | 2,173 | 2,022 | 2,003 | 1,952 | → |
| Alden | Census-Designated Place | McHenry | ... | 42 | 32 | 113 | → |
| Aledo | City | Mercer | 3,743 | 3,624 | 3,648 | 3,634 | → |
| Alexander | Census-Designated Place | Morgan | 111 | 94 | 102 | 155 | → |
| Alexis | Village | Warren / Mercer | 898 | 875 | 843 | 787 | → |
| Algonquin | Village | McHenry / Kane | 12,259 | 23,452 | 30,065 | 29,708 | → |
| Alhambra | Village | Madison | 712 | 639 | 681 | 616 | → |
| Allendale | Village | Wabash | 476 | 519 | 472 | 456 | → |
| Allenville | Village | Moultrie | 166 | 154 | 150 | 133 | → |
| Allerton | Village | Vermilion / Champaign | 296 | 292 | 288 | 266 | → |
| Alma | Village | Marion | 391 | 385 | 322 | 314 | → |
| Alpha | Village | Henry | 738 | 725 | 669 | 672 | → |
| Alsey | Village | Scott | 253 | 243 | 227 | 192 | → |
| Alsip | Village | Cook | 18,214 | 19,657 | 19,271 | 19,071 | → |
| Altamont | City | Effingham | 2,297 | 2,319 | 2,336 | 2,220 | → |
| Alto Pass | Village | Union | 426 | 392 | 387 | 313 | → |
| Alton | City | Madison | 33,170 | 30,332 | 27,936 | 25,686 | → |
| Altona | Village | Knox | 562 | 554 | 529 | 463 | → |
| Alvan (Alvin) | Village | Vermilion | 343 | 313 | 270 | 235 | → |
| Amboy | City | Lee | 2,381 | 2,637 | 2,515 | 2,282 | → |
| Anchor | Village | McLean | 178 | 166 | 146 | 161 | → |
| Andalusia | Village | Rock Island | 1,024 | 1,081 | 1,170 | 1,179 | → |
| Andover | Village | Henry | 593 | 593 | 578 | 556 | → |
| Andres | Census-Designated Place | Will | ... | 17 | 17 | 43 | → |
| Anna | City | Union | 5,233 | 5,202 | 4,441 | 4,298 | → |
| Annapolis | Census-Designated Place | Crawford | 39 | 47 | 55 | 106 | → |
| Annawan | Town | Henry / Bureau | 809 | 859 | 887 | 886 | → |
| Antioch | Village | Lake | 6,206 | 8,793 | 14,479 | 14,622 | → |
| Apple Canyon Lake | Census-Designated Place | Jo Daviess | 288 | 420 | 558 | 574 | → |
| Apple River | Village | Jo Daviess | 401 | 384 | 365 | 341 | → |
| Arbury Hills | Census-Designated Place | Will | 1,006 | 938 | 1,093 | 1,132 | → |
| Arcola | City | Douglas | 2,698 | 2,687 | 2,914 | 2,928 | → |
| Arenzville | Village | Cass | 396 | 415 | 409 | 368 | → |
| Argenta | Village | Macon | 940 | 898 | 939 | 913 | → |
| Argyle | Census-Designated Place | Boone / Winnebago | 165 | 226 | 204 | 332 | → |
| Arlington | Village | Bureau | 198 | 210 | 193 | 169 | → |
| Arlington Heights | Village | Cook | 75,205 | 76,624 | 75,185 | 77,663 | → |
| Armington | Village | Tazewell | 348 | 369 | 347 | 312 | → |
| Aroma Park | Village | Kankakee | 805 | 1,224 | 743 | 665 | → |
| Arrowsmith | Village | McLean | 313 | 294 | 289 | 275 | → |
| Arthur | Village | Douglas / Moultrie | 2,169 | 2,216 | 2,286 | 2,231 | → |
| Ashkum | Village | Iroquois | 675 | 717 | 764 | 746 | → |
| Ashland | Village | Cass | 1,257 | 1,361 | 1,336 | 1,220 | → |
| Ashley | City | Washington | 583 | 625 | 536 | 460 | → |
| Ashmore | Village | Coles | 826 | 811 | 781 | 638 | → |
| Ashton | Village | Lee | 1,040 | 1,122 | 972 | 965 | → |
| Assumption | City | Christian | 1,253 | 1,256 | 1,174 | 1,158 | → |
| Astoria | Town | Fulton | 1,249 | 1,174 | 1,140 | 929 | → |
| Athens | City | Menard | 1,553 | 1,736 | 1,999 | 1,970 | → |
| Atkinson | Town | Henry | 958 | 994 | 989 | 957 | → |
| Atlanta | City | Logan | 1,619 | 1,656 | 1,694 | 1,669 | → |
| Atwood | Village | Piatt / Douglas | 1,255 | 1,316 | 1,221 | 1,115 | → |
| Auburn | City | Sangamon | 3,765 | 4,461 | 4,813 | 4,553 | → |
| Augusta | Village | Hancock | 619 | 679 | 587 | 558 | → |
| Aurora | City | Kane / DuPage / Will / Kendall | 100,341 | 143,002 | 197,964 | 180,529 | → |
| Ava | City | Jackson | 674 | 663 | 654 | 550 | → |
| Aviston | Village | Clinton | 1,063 | 1,242 | 1,960 | 2,342 | → |
| Avon | Village | Fulton / Warren | 963 | 945 | 799 | 701 | → |
| Baileyville | Census-Designated Place | Ogle / Stephenson | 184 | 168 | 170 | 187 | → |
| Baldwin | Village | Randolph | 440 | 435 | 373 | 319 | → |
| Banner | Village | Fulton | 160 | 215 | 189 | 161 | → |
| Bannockburn | Village | Lake | 1,379 | 1,438 | 1,583 | 1,375 | → |
| Bardolph | Village | McDonough | 301 | 279 | 251 | 208 | → |
| Barrington | Village | Cook / Lake | 9,609 | 10,132 | 10,320 | 10,724 | → |
| Barrington Hills | Village | Cook / McHenry / Lake / Kane | 4,162 | 3,943 | 4,231 | 4,109 | → |
| Barry | City | Pike | 1,418 | 1,411 | 1,310 | 1,303 | → |
| Barstow | Census-Designated Place | Rock Island | 71 | 82 | 152 | 89 | → |
| Bartelso | Village | Clinton | 496 | 590 | 602 | 630 | → |
| Bartlett | Village | DuPage / Cook / Kane | 19,714 | 36,560 | 41,235 | 41,126 | → |
| Bartonville | Village | Peoria | 6,503 | 6,322 | 6,480 | 5,947 | → |
| Basco | Village | Hancock | 99 | 97 | 98 | 79 | → |
| Batavia | City | Kane / DuPage | 17,443 | 23,839 | 26,236 | 26,505 | → |
| Batchtown | Village | Calhoun | 225 | 224 | 214 | 166 | → |
| Bath | Village | Mason | 388 | 342 | 333 | 276 | → |
| Bay View Gardens | Village | Woodford | 418 | 377 | 380 | 356 | → |
| Baylis | Village | Pike | 257 | 269 | 204 | 170 | → |
| Beach Park | Village | Lake | 9,521 | 10,421 | 13,632 | 14,260 | → |
| Beardstown | City | Cass | 5,319 | 5,807 | 6,161 | 5,951 | → |
| Beason | Census-Designated Place | Logan | 154 | 176 | 168 | 147 | → |
| Beaverville | Village | Iroquois | 278 | 394 | 357 | 306 | → |
| Beckemeyer | Village | Clinton | 1,103 | 1,075 | 1,034 | 920 | → |
| Bedford Park | Village | Cook | 575 | 561 | 589 | 588 | → |
| Beecher | Village | Will | 2,214 | 2,205 | 4,339 | 4,714 | → |
| Beecher City | Village | Effingham | 437 | 493 | 461 | 429 | → |
| Belgium | Village | Vermilion | 549 | 455 | 396 | 358 | → |
| Belknap | Village | Johnson | 125 | 133 | 104 | 86 | → |
| Belle Prairie City | Town | Hamilton | 64 | 60 | 52 | 47 | → |
| Belle Rive | Village | Jefferson | 396 | 364 | 360 | 309 | → |
| Belleville | City | St. Clair | 43,120 | 42,183 | 44,239 | 42,386 | → |
| Bellevue | Village | Peoria | 2,154 | 1,942 | 1,997 | 1,879 | → |
| Bellflower | Village | McLean | 413 | 393 | 359 | 337 | → |
| Bellmont | Village | Wabash | 273 | 296 | 276 | 245 | → |
| Bellwood | Village | Cook | 20,249 | 20,535 | 19,055 | 18,790 | → |
| Belvidere | City | Boone | 16,715 | 20,885 | 25,641 | 25,333 | → |
| Bement | Village | Piatt | 1,699 | 1,748 | 1,728 | 1,483 | → |
| Benld | City | Macoupin | 1,627 | 1,547 | 1,556 | 1,469 | → |
| Bensenville | Village | DuPage / Cook | 15,525 | 18,241 | 18,407 | 18,814 | → |
| Benson | Village | Woodford | 410 | 409 | 433 | 412 | → |
| Bentley | Town | Hancock | 27 | 46 | 35 | 27 | → |
| Benton | City | Franklin | 7,269 | 6,947 | 7,083 | 6,717 | → |
| Berkeley | Village | Cook | 5,141 | 5,242 | 5,207 | 5,341 | → |
| Berlin | Village | Sangamon | 237 | 154 | 176 | 143 | → |
| Berwyn | City | Cook | 45,538 | 54,030 | 56,650 | 57,233 | → |
| Bethalto | Village | Madison | 9,532 | 9,517 | 9,514 | 9,316 | → |
| Bethany | Village | Moultrie | 1,393 | 1,308 | 1,348 | 1,256 | → |
| Beverly | Census-Designated Place | Adams | 21 | 13 | 11 | 72 | → |
| Big Foot Prairie | Census-Designated Place | McHenry | ... | ... | ... | 65 | → |
| Big Rock | Village | Kane | 776 | 577 | 1,132 | 1,106 | → |
| Biggsville | Village | Henderson | 349 | 344 | 315 | 304 | → |
| Bingham | Village | Fayette | 98 | 114 | 80 | 62 | → |
| Bishop Hill | Village | Henry | 131 | 130 | 128 | 113 | → |
| Bismarck | Village | Vermilion | 627 | 572 | 574 | 584 | → |
| Blairsville | Census-Designated Place | Williamson | 128 | 95 | 225 | 243 | → |
| Blandinsville | Village | McDonough | 767 | 781 | 649 | 565 | → |
| Bloomfield | Census-Designated Place | Adams | 26 | 22 | 21 | 32 | → |
| Bloomingdale | Village | DuPage | 16,649 | 21,658 | 22,071 | 22,376 | → |
| Bloomington | City | McLean | 52,288 | 65,540 | 76,683 | 78,701 | → |
| Blue Island | City | Cook | 21,198 | 23,510 | 23,701 | 22,562 | → |
| Blue Mound | Village | Macon | 1,163 | 1,132 | 1,158 | 1,132 | → |
| Bluffs | Village | Scott | 774 | 761 | 715 | 622 | → |
| Bluford | Village | Jefferson | 747 | 796 | 691 | 625 | → |
| Bolingbrook | Village | Will / DuPage | 41,041 | 56,396 | 73,362 | 73,949 | → |
| Bondville | Village | Champaign | 414 | 497 | 440 | 386 | → |
| Bone Gap | Village | Edwards | 271 | 272 | 246 | 185 | → |
| Bonfield | Village | Kankakee | 302 | 389 | 382 | 351 | → |
| Bonnie | Village | Jefferson | 409 | 425 | 401 | 373 | → |
| Bonnie Brae | Census-Designated Place | Will | 1,375 | 1,353 | 1,396 | 1,287 | → |
| Boody | Census-Designated Place | Macon | 192 | 100 | 276 | 232 | → |
| Boulder Hill | Census-Designated Place | Kendall | 8,894 | 8,169 | 8,108 | 8,394 | → |
| Bourbonnais | Village | Kankakee | 14,036 | 15,350 | 18,756 | 18,122 | → |
| Bowen | Village | Hancock | 459 | 541 | 494 | 463 | → |
| Braceville | Village | Will / Grundy | 603 | 790 | 799 | 723 | → |
| Bradford | Village | Stark | 709 | 781 | 766 | 679 | → |
| Bradley | Village | Kankakee | 10,947 | 12,945 | 15,904 | 15,420 | → |
| Braidwood | City | Will / Grundy | 3,666 | 5,276 | 6,216 | 6,195 | → |
| Breese | City | Clinton | 3,675 | 4,060 | 4,442 | 4,645 | → |
| Bridgeport | City | Lawrence | 2,163 | 2,094 | 1,915 | 1,808 | → |
| Bridgeview | Village | Cook | 14,285 | 15,346 | 16,468 | 17,013 | → |
| Brighton | Village | Macoupin / Jersey | 2,317 | 2,032 | 2,253 | 2,219 | → |
| Brimfield | Village | Peoria | 808 | 920 | 864 | 779 | → |
| Broadlands | Village | Champaign | 349 | 320 | 349 | 316 | → |
| Broadview | Village | Cook | 8,382 | 8,315 | 7,917 | 7,995 | → |
| Broadwell | Village | Logan | 155 | 170 | 145 | 141 | → |
| Brocton | Village | Edgar | 322 | 322 | 322 | 272 | → |
| Brookfield | Village | Cook | 18,846 | 19,034 | 18,974 | 19,518 | → |
| Brooklyn | Village | St. Clair | 1,144 | 665 | 743 | 652 | → |
| Brookport | City | Massac | 1,027 | 1,026 | 977 | 723 | → |
| Broughton | Village | Hamilton | 218 | 194 | 192 | 183 | → |
| Browning | Village | Schuyler | 193 | 133 | 137 | 120 | → |
| Browns | Village | Edwards | 207 | 172 | 134 | 138 | → |
| Brownstown | Village | Fayette | 689 | 692 | 766 | 693 | → |
| Brussels | Village | Calhoun | 136 | 145 | 141 | 122 | → |
| Bryant | Village | Fulton | 273 | 263 | 222 | 167 | → |
| Buckingham | Village | Kankakee | 340 | 237 | 300 | 242 | → |
| Buckley | Village | Iroquois | 559 | 591 | 604 | 490 | → |
| Buckner | Village | Franklin | 478 | 479 | 460 | 408 | → |
| Buda | Village | Bureau | 572 | 581 | 538 | 479 | → |
| Buffalo | Village | Sangamon | 503 | 498 | 499 | 447 | → |
| Buffalo Grove | Village | Lake / Cook | 36,465 | 43,128 | 41,509 | 43,199 | → |
| Buffalo Prairie | Census-Designated Place | Rock Island | 69 | 102 | 85 | 64 | → |
| Bull Valley | Village | McHenry | 1,434 | 1,044 | 1,114 | 1,139 | → |
| Bulpitt | Village | Christian | 206 | 206 | 222 | 214 | → |
| Buncombe | Village | Johnson | 217 | 191 | 203 | 207 | → |
| Bunker Hill | City | Macoupin | 1,830 | 1,824 | 1,778 | 1,631 | → |
| Burbank | City | Cook | 27,588 | 27,899 | 28,906 | 29,461 | → |
| Bureau Junction | Village | Bureau | 354 | 363 | 321 | 286 | → |
| Burlington | Village | Kane | 647 | 826 | 624 | 536 | → |
| Burnham | Village | Cook | 3,909 | 4,282 | 4,206 | 4,046 | → |
| Burnt Prairie | Village | White | 81 | 55 | 52 | 34 | → |
| Burr Ridge | Village | DuPage / Cook | 8,176 | 10,686 | 10,495 | 11,191 | → |
| Burton | Census-Designated Place | Adams | 25 | 21 | 9 | 103 | → |
| Burtons Bridge | Census-Designated Place | McHenry | 120 | 217 | 202 | 226 | → |
| Bush | Village | Williamson | 351 | 266 | 275 | 241 | → |
| Bushnell | City | McDonough | 3,253 | 3,288 | 3,114 | 2,721 | → |
| Butler | Village | Montgomery | 166 | 192 | 175 | 166 | → |
| Byron | City | Ogle | 2,440 | 2,933 | 3,836 | 3,789 | → |
| Cabery | Village | Ford / Kankakee | 268 | 247 | 266 | 233 | → |
| Cable | Census-Designated Place | Mercer | 140 | 128 | 147 | 117 | → |
| Cahokia Heights (incl. Centreville, Cahokia, Alorton) | City | St. Clair | 28,052 | 25,028 | 22,597 | 17,903 | → |
| Cairo | City | Alexander | 4,911 | 3,633 | 2,831 | 1,739 | → |
| Caledonia | Village | Boone | 318 | 232 | 193 | 185 | → |
| Calhoun | Village | Richland | 232 | 222 | 172 | 159 | → |
| Calumet City | City | Cook | 37,783 | 38,963 | 37,159 | 36,043 | → |
| Calumet Park | Village | Cook | 8,417 | 8,539 | 7,831 | 7,019 | → |
| Camargo | Village | Douglas | 372 | 462 | 445 | 451 | → |
| Cambria | Village | Williamson | 1,304 | 1,308 | 1,227 | 1,504 | → |
| Cambridge | Village | Henry | 2,134 | 2,198 | 2,161 | 2,091 | → |
| Camden | Village | Schuyler | 115 | 99 | 85 | 63 | → |
| Cameron | Census-Designated Place | Warren | 186 | 180 | 175 | 188 | → |
| Camp Point | Village | Adams | 1,228 | 1,211 | 1,136 | 1,130 | → |
| Campbell Hill | Village | Jackson | 351 | 335 | 336 | 311 | → |
| Campbell's Island | Census-Designated Place | Rock Island | 392 | 407 | 341 | 275 | → |
| Campton Hills | Village | Kane | 4,985 | 8,402 | 11,065 | 10,878 | → |
| Campus | Village | Livingston | 137 | 155 | 166 | 143 | → |
| Candlewick Lake | Census-Designated Place | Boone | 493 | 4,095 | 5,131 | 5,115 | → |
| Canton | City | Fulton | 14,032 | 15,209 | 14,724 | 13,390 | → |
| Cantrall | Village | Sangamon | 123 | 146 | 139 | 142 | → |
| Capron | Village | Boone | 720 | 1,117 | 1,376 | 1,390 | → |
| Carbon Cliff | Village | Rock Island | 1,628 | 1,731 | 2,071 | 1,840 | → |
| Carbon Hill | Village | Grundy | 369 | 393 | 345 | 376 | → |
| Carbondale | City | Jackson / Williamson | 27,577 | 21,826 | 26,409 | 22,300 | → |
| Carlinville | City | Macoupin | 5,562 | 6,179 | 5,917 | 5,779 | → |
| Carlock | Village | McLean | 431 | 403 | 554 | 542 | → |
| Carlyle | City | Clinton | 3,490 | 3,428 | 3,300 | 3,246 | → |
| Carman | Census-Designated Place | Henderson | 99 | 92 | 83 | 67 | → |
| Carmi | City | White | 5,700 | 5,401 | 5,246 | 4,861 | → |
| Carol Stream | Village | DuPage | 31,726 | 40,671 | 39,497 | 39,851 | → |
| Carpentersville | Village | Kane | 23,109 | 31,370 | 37,679 | 37,988 | → |
| Carrier Mills | Village | Saline | 1,992 | 1,936 | 1,653 | 1,667 | → |
| Carrollton | City | Greene | 2,543 | 2,602 | 2,484 | 2,488 | → |
| Carterville | City | Williamson | 4,137 | 4,630 | 5,560 | 5,859 | → |
| Carthage | City | Hancock | 2,698 | 2,713 | 2,609 | 2,515 | → |
| Cary | Village | McHenry | 10,054 | 15,647 | 18,339 | 17,833 | → |
| Casey | City | Clark / Cumberland | 2,916 | 2,943 | 2,784 | 2,438 | → |
| Caseyville | Village | St. Clair | 5,042 | 4,589 | 4,209 | 4,393 | → |
| Catlin | Village | Vermilion | 2,187 | 2,112 | 2,042 | 1,994 | → |
| Cave-In-Rock | Village | Hardin | 395 | 341 | 318 | 228 | → |
| Cedar Point | Village | LaSalle | 321 | 264 | 273 | 267 | → |
| Cedarville | Village | Stephenson | 751 | 736 | 742 | 672 | → |
| Central City | Village | Marion | 1,415 | 1,378 | 1,172 | 1,104 | → |
| Centralia | City | Marion / Clinton / Washington / Jefferson | 14,517 | 14,396 | 13,037 | 12,168 | → |
| Cerro Gordo | Village | Piatt | 1,438 | 1,441 | 1,423 | 1,318 | → |
| Chadwick | Village | Carroll | 568 | 503 | 551 | 483 | → |
| Champaign | City | Champaign | 64,664 | 70,118 | 81,245 | 88,317 | → |
| Chandlerville | Village | Cass | 660 | 704 | 557 | 530 | → |
| Channahon | Village | Will / Grundy | 4,743 | 7,645 | 12,571 | 13,445 | → |
| Channel Lake | Census-Designated Place | Lake | 1,660 | 1,785 | 1,664 | 1,581 | → |
| Chapin | Village | Morgan | 632 | 596 | 512 | 478 | → |
| Charleston | City | Coles | 20,465 | 21,209 | 21,848 | 17,619 | → |
| Chatham | Village | Sangamon | 6,264 | 8,614 | 11,730 | 14,381 | → |
| Chatsworth | Town | Livingston | 1,189 | 1,292 | 1,211 | 1,187 | → |
| Chebanse | Village | Kankakee / Iroquois | 1,079 | 1,149 | 1,065 | 1,052 | → |
| Chemung | Census-Designated Place | McHenry | 276 | 266 | 308 | 276 | → |
| Chenoa | City | McLean | 1,739 | 1,854 | 1,785 | 1,720 | → |
| Cherry | Village | Bureau | 518 | 502 | 486 | 433 | → |
| Cherry Valley | Village | Winnebago / Boone | 2,775 | 2,802 | 2,967 | 2,897 | → |
| Chester | City | Randolph | 8,269 | 4,843 | 8,586 | 6,828 | → |
| Chesterfield | Village | Macoupin | 247 | 223 | 188 | 169 | → |
| Chestnut | Census-Designated Place | Logan | 223 | 196 | 246 | 220 | → |
| Chicago | City | Cook / DuPage | 2,783,485 | 2,895,966 | 2,695,674 | 2,748,331 | → |
| Chicago Heights | City | Cook | 32,970 | 32,823 | 30,393 | 27,480 | → |
| Chicago Ridge | Village | Cook | 13,639 | 14,267 | 14,304 | 14,431 | → |
| Chillicothe | City | Peoria | 6,000 | 6,022 | 6,095 | 6,129 | → |
| Chrisman | City | Edgar | 1,259 | 1,310 | 1,372 | 1,308 | → |
| Christopher | City | Franklin | 2,879 | 2,864 | 2,849 | 2,690 | → |
| Cicero | Town | Cook | 67,441 | 85,993 | 84,241 | 85,289 | → |
| Cisco | Village | Piatt | 262 | 261 | 256 | 258 | → |
| Cisne | Village | Wayne | 650 | 684 | 677 | 630 | → |
| Cissna Park | Village | Iroquois | 811 | 805 | 868 | 814 | → |
| Claremont | Village | Richland | 256 | 209 | 174 | 162 | → |
| Clarendon Hills | Village | DuPage | 7,030 | 7,753 | 8,441 | 8,700 | → |
| Clay City | Village | Clay | 929 | 1,013 | 964 | 854 | → |
| Clayton | Village | Adams | 726 | 853 | 707 | 640 | → |
| Clear Lake | Village | Sangamon | 193 | 245 | 222 | 204 | → |
| Cleveland | Village | Henry | 282 | 252 | 190 | 159 | → |
| Clifton | Village | Iroquois | 1,347 | 1,307 | 1,467 | 1,352 | → |
| Clinton | City | De Witt | 7,457 | 7,370 | 7,400 | 7,000 | → |
| Coal City | Village | Grundy / Will | 4,023 | 4,852 | 5,700 | 5,716 | → |
| Coal Valley | Village | Rock Island / Henry | 3,512 | 3,584 | 3,736 | 3,881 | → |
| Coalton | Village | Montgomery | 347 | 301 | 304 | 310 | → |
| Coatsburg | Village | Adams | 199 | 222 | 147 | 153 | → |
| Cobden | Village | Union | 1,121 | 1,153 | 1,145 | 1,076 | → |
| Coffeen | City | Montgomery | 735 | 729 | 685 | 644 | → |
| Colchester | City | McDonough | 1,633 | 1,510 | 1,396 | 1,111 | → |
| Coleta | Village | Whiteside | 153 | 160 | 162 | 164 | → |
| Colfax | Village | McLean | 863 | 989 | 1,061 | 999 | → |
| Collinsville | City | Madison / St. Clair | 23,006 | 24,673 | 25,591 | 24,408 | → |
| Colona | City | Henry | 5,049 | 5,067 | 5,151 | 5,052 | → |
| Colp | Village | Williamson | 240 | 226 | 210 | 178 | → |
| Columbia | City | Monroe / St. Clair | 6,089 | 7,875 | 9,698 | 11,012 | → |
| Columbus | Village | Adams | 90 | 112 | 99 | 113 | → |
| Como | Census-Designated Place | Whiteside | 537 | 591 | 567 | 528 | → |
| Compton | Village | Lee | 343 | 351 | 303 | 271 | → |
| Concord | Village | Morgan | 172 | 174 | 167 | 156 | → |
| Congerville | Village | Woodford | 397 | 326 | 480 | 495 | → |
| Cooksville | Village | McLean | 211 | 211 | 189 | 156 | → |
| Coral | Census-Designated Place | McHenry | ... | ... | ... | 16 | → |
| Cordova | Village | Rock Island | 657 | 654 | 676 | 675 | → |
| Cornell | Village | Livingston | 556 | 503 | 483 | 450 | → |
| Cornland | Census-Designated Place | Logan | 63 | 85 | 93 | 89 | → |
| Cortland | Town | DeKalb | 1,035 | 2,090 | 4,271 | 4,401 | → |
| Coulterville | Village | Randolph | 990 | 1,149 | 945 | 831 | → |
| Country Club Hills | City | Cook | 15,495 | 16,211 | 16,735 | 16,775 | → |
| Countryside | City | Cook | 5,905 | 6,098 | 5,878 | 6,427 | → |
| Cowden | Village | Shelby | 599 | 614 | 622 | 516 | → |
| Coyne Center | Census-Designated Place | Rock Island | 969 | 906 | 827 | 877 | → |
| Crab Orchard | Census-Designated Place | Williamson | 284 | 437 | 333 | 356 | → |
| Crainville | Village | Williamson | 1,034 | 999 | 1,285 | 1,442 | → |
| Creal Springs | City | Williamson | 786 | 705 | 543 | 506 | → |
| Crescent City | Village | Iroquois | 541 | 637 | 615 | 552 | → |
| Crest Hill | City | Will | 10,938 | 13,481 | 20,801 | 20,457 | → |
| Creston | Village | Ogle | 553 | 567 | 667 | 627 | → |
| Crestwood | Village | Cook | 11,054 | 11,298 | 10,960 | 10,819 | → |
| Crete | Village | Will | 6,958 | 8,201 | 8,224 | 8,454 | → |
| Creve Coeur | Village | Tazewell | 5,829 | 5,444 | 5,485 | 4,940 | → |
| Crossville | Village | White | 838 | 741 | 758 | 625 | → |
| Crystal Lake | City | McHenry | 25,457 | 37,976 | 40,749 | 40,264 | → |
| Crystal Lawns | Census-Designated Place | Will | 2,086 | 1,991 | 1,872 | 1,830 | → |
| Cuba | City | Fulton | 1,451 | 1,427 | 1,306 | 1,186 | → |
| Cullom | Village | Livingston | 568 | 556 | 568 | 518 | → |
| Curran | Village | Sangamon | 261 | 247 | 210 | 212 | → |
| Custer Park | Census-Designated Place | Will | 102 | 98 | 80 | 112 | → |
| Cutler | Village | Perry | 523 | 545 | 441 | 367 | → |
| Cypress | Village | Johnson | 284 | 268 | 234 | 219 | → |
| Dahlgren | Village | Hamilton | 512 | 514 | 525 | 503 | → |
| Dakota | Village | Stephenson | 540 | 508 | 507 | 500 | → |
| Dallas City | City | Hancock / Henderson | 962 | 1,028 | 945 | 811 | → |
| Dalton City | Village | Moultrie | 576 | 577 | 546 | 458 | → |
| Dalzell | Village | Bureau / LaSalle | 587 | 611 | 716 | 664 | → |
| Damiansville | Village | Clinton | 430 | 459 | 486 | 567 | → |
| Dana | Village | LaSalle | 149 | 171 | 159 | 159 | → |
| Danforth | Village | Iroquois | 463 | 579 | 605 | 594 | → |
| Danvers | Village | McLean | 1,041 | 1,182 | 1,153 | 1,092 | → |
| Danville | City | Vermilion | 35,502 | 34,557 | 33,027 | 29,204 | → |
| Darien | City | DuPage | 20,673 | 22,943 | 22,037 | 22,047 | → |
| Darmstadt | Census-Designated Place | St. Clair | 80 | 63 | 68 | 49 | → |
| Davis | Village | Stephenson | 537 | 665 | 678 | 592 | → |
| Davis Junction | Village | Ogle | 256 | 941 | 2,362 | 2,509 | → |
| Dawson | Village | Sangamon | 541 | 520 | 505 | 518 | → |
| Dayton | Census-Designated Place | LaSalle | 370 | 402 | 537 | 528 | → |
| De Land | Village | Piatt | 464 | 470 | 445 | 450 | → |
| De Pue | Village | Bureau | 1,728 | 1,840 | 1,834 | 1,627 | → |
| De Soto | Village | Jackson | 1,534 | 1,633 | 1,585 | 1,410 | → |
| De Witt | Village | De Witt | 122 | 185 | 184 | 163 | → |
| Decatur | City | Macon | 85,464 | 82,061 | 76,122 | 71,152 | → |
| Deer Creek | Village | Tazewell / Woodford | 630 | 602 | 706 | 664 | → |
| Deer Grove | Village | Whiteside | 21 | 47 | 48 | 36 | → |
| Deer Park | Village | Lake / Cook | 2,847 | 3,172 | 3,128 | 3,687 | → |
| Deerfield | Village | Lake / Cook | 17,256 | 18,487 | 18,227 | 19,165 | → |
| DeKalb | City | DeKalb | 35,887 | 39,017 | 44,124 | 40,304 | → |
| Delavan | City | Tazewell | 1,635 | 1,799 | 1,705 | 1,577 | → |
| Des Plaines | City | Cook | 54,410 | 56,900 | 58,252 | 60,672 | → |
| Detroit | Village | Pike | 126 | 95 | 85 | 75 | → |
| Dewey | Census-Designated Place | Champaign | 66 | 73 | 51 | 105 | → |
| Diamond | Village | Grundy / Will | 1,117 | 1,386 | 2,531 | 2,637 | → |
| Dieterich | Village | Effingham | 594 | 608 | 617 | 896 | → |
| Divernon | Village | Sangamon | 1,160 | 1,197 | 1,173 | 1,142 | → |
| Dix | Village | Jefferson | 470 | 501 | 450 | 468 | → |
| Dixmoor | Village | Cook | 3,668 | 3,934 | 3,584 | 3,019 | → |
| Dixon | City | Lee | 15,336 | 15,835 | 15,752 | 15,400 | → |
| Dolton | Village | Cook | 24,023 | 25,460 | 23,033 | 21,418 | → |
| Dongola | Village | Union | 733 | 817 | 724 | 663 | → |
| Donnellson | Village | Montgomery / Bond | 174 | 258 | 210 | 155 | → |
| Donovan | Village | Iroquois | 361 | 340 | 314 | 249 | → |
| Dorchester | Village | Macoupin | 153 | 141 | 151 | 129 | → |
| Dover | Village | Bureau | 160 | 172 | 164 | 136 | → |
| Dowell | Village | Jackson | 465 | 438 | 408 | 366 | → |
| Downers Grove | Village | DuPage | 47,726 | 49,288 | 48,880 | 50,276 | → |
| Downs | Village | McLean | 754 | 850 | 994 | 1,199 | → |
| Du Bois | Village | Washington | 249 | 218 | 205 | 179 | → |
| Du Quoin | City | Perry | 6,744 | 6,492 | 6,106 | 5,827 | → |
| Dundas | Census-Designated Place | Richland | 181 | 171 | 136 | 146 | → |
| Dunfermline | Village | Fulton | 260 | 270 | 313 | 262 | → |
| Dunlap | Village | Peoria | 1,160 | 1,146 | 1,503 | 1,616 | → |
| Dupo | Village | St. Clair / Monroe | 3,849 | 4,021 | 4,179 | 3,987 | → |
| Durand | Village | Winnebago | 1,048 | 1,069 | 1,457 | 1,391 | → |
| Dwight | Village | Livingston / Grundy | 4,234 | 4,365 | 4,262 | 4,026 | → |
| Eagarville | Village | Macoupin | 120 | 128 | 127 | 117 | → |
| Eagle Lake | Census-Designated Place | Will | ... | ... | ... | 76 | → |
| Earlville | City | LaSalle | 1,469 | 1,752 | 1,702 | 1,615 | → |
| East Alton | Village | Madison | 7,222 | 6,874 | 6,274 | 5,780 | → |
| East Brooklyn | Village | Grundy | 100 | 111 | 110 | 77 | → |
| East Cape Girardeau | Village | Alexander | 451 | 431 | 383 | 290 | → |
| East Carondelet | Village | St. Clair | 630 | 298 | 506 | 390 | → |
| East Dubuque | City | Jo Daviess | 2,613 | 2,238 | 1,705 | 1,495 | → |
| East Dundee | Village | Kane / Cook | 2,663 | 2,978 | 2,856 | 3,181 | → |
| East Galesburg | Village | Knox | 839 | 781 | 816 | 763 | → |
| East Gillespie | Village | Macoupin | 212 | 234 | 270 | 269 | → |
| East Hazel Crest | Village | Cook | 1,567 | 1,607 | 1,545 | 1,294 | → |
| East Lynn | Census-Designated Place | Vermilion | 56 | 88 | 55 | 90 | → |
| East Moline | City | Rock Island | 20,501 | 21,555 | 21,302 | 21,361 | → |
| East Peoria | City | Tazewell | 22,637 | 22,693 | 23,457 | 22,493 | → |
| East St. Louis | City | St. Clair | 40,871 | 31,667 | 26,938 | 18,462 | → |
| Easton | Village | Mason | 351 | 358 | 321 | 316 | → |
| Eddyville | Village | Pope | 151 | 143 | 103 | 99 | → |
| Edgewood | Village | Effingham | 502 | 529 | 444 | 397 | → |
| Edgington | Census-Designated Place | Rock Island | 327 | 357 | 326 | 391 | → |
| Edinburg | Village | Christian | 1,067 | 1,136 | 1,078 | 1,082 | → |
| Edwardsville | City | Madison | 16,130 | 21,703 | 24,409 | 26,845 | → |
| Effingham | City | Effingham | 12,279 | 12,446 | 12,348 | 12,303 | → |
| El Dara | Village | Pike | 86 | 89 | 75 | 64 | → |
| El Paso | City | Woodford / McLean | 2,531 | 2,804 | 2,813 | 2,753 | → |
| Elburn | Village | Kane | 1,430 | 2,768 | 5,596 | 6,184 | → |
| Eldorado | City | Saline | 4,687 | 4,520 | 4,131 | 3,746 | → |
| Eldred | Village | Greene | 254 | 223 | 201 | 151 | → |
| Elgin | City | Kane / Cook | 77,323 | 94,638 | 108,218 | 114,834 | → |
| Eliza | Census-Designated Place | Mercer | ... | ... | 8 | 25 | → |
| Elizabeth | Village | Jo Daviess | 690 | 712 | 766 | 706 | → |
| Elizabethtown | Village | Hardin | 427 | 352 | 311 | 230 | → |
| Elk Grove Village | Village | Cook / DuPage | 33,488 | 34,666 | 33,166 | 32,821 | → |
| Elkhart | Village | Logan | 475 | 426 | 407 | 451 | → |
| Elkville | Village | Jackson | 958 | 981 | 928 | 837 | → |
| Elliott | Village | Ford | 312 | 332 | 296 | 276 | → |
| Ellis Grove | Village | Randolph | 364 | 400 | 370 | 328 | → |
| Ellisville | Village | Fulton | 116 | 85 | 96 | 88 | → |
| Ellsworth | Village | McLean | 224 | 270 | 192 | 183 | → |
| Elmhurst | City | DuPage / Cook | 42,084 | 42,946 | 44,120 | 45,784 | → |
| Elmwood | City | Peoria | 1,849 | 1,957 | 2,097 | 2,075 | → |
| Elmwood Park | Village | Cook | 23,206 | 25,408 | 24,883 | 24,526 | → |
| Elsah | Village | Jersey | 888 | 632 | 673 | 525 | → |
| Elvaston | Village | Hancock | 198 | 155 | 165 | 149 | → |
| Elwin | Census-Designated Place | Macon | 79 | 51 | 74 | 119 | → |
| Elwood | Village | Will | 1,123 | 1,609 | 2,278 | 2,230 | → |
| Emden | Village | Logan | 481 | 521 | 485 | 465 | → |
| Emington | Village | Livingston | 135 | 120 | 113 | 101 | → |
| Energy | Village | Williamson | 1,075 | 1,159 | 1,130 | 970 | → |
| Enfield | Village | White | 690 | 621 | 601 | 797 | → |
| Equality | Village | Gallatin | 748 | 739 | 595 | 535 | → |
| Erie | Village | Whiteside | 1,556 | 1,580 | 1,603 | 1,520 | → |
| Essex | Village | Kankakee | 477 | 576 | 808 | 839 | → |
| Eureka | City | Woodford | 4,558 | 5,048 | 5,342 | 5,225 | → |
| Evanston | City | Cook | 73,224 | 74,269 | 74,483 | 78,102 | → |
| Evansville | Village | Randolph | 858 | 741 | 694 | 548 | → |
| Evergreen Park | Village | Cook | 20,874 | 20,820 | 19,848 | 19,944 | → |
| Ewing | Village | Franklin | 269 | 312 | 307 | 304 | → |
| Exeter | Village | Scott | 59 | 72 | 65 | 87 | → |
| Fairbury | City | Livingston | 3,630 | 3,938 | 3,816 | 3,639 | → |
| Fairfield | City | Wayne | 5,596 | 5,485 | 5,167 | 4,901 | → |
| Fairmont | Census-Designated Place | Will | 2,806 | 2,563 | 2,459 | 2,389 | → |
| Fairmont City | Village | St. Clair / Madison | 2,125 | 2,431 | 2,645 | 2,261 | → |
| Fairmount | Village | Vermilion | 689 | 648 | 642 | 615 | → |
| Fairview | Village | Fulton | 510 | 498 | 522 | 428 | → |
| Fairview Heights | City | St. Clair | 14,952 | 14,981 | 17,065 | 16,714 | → |
| Fall Creek | Census-Designated Place | Adams | 30 | 42 | 29 | 31 | → |
| Farina | Village | Fayette / Marion | 575 | 558 | 516 | 542 | → |
| Farmer City | City | De Witt | 2,145 | 2,059 | 2,012 | 1,833 | → |
| Farmersville | Village | Montgomery | 640 | 721 | 717 | 686 | → |
| Farmington | City | Fulton / Peoria | 2,562 | 2,498 | 2,445 | 2,394 | → |
| Fayetteville | Village | St. Clair | 303 | 383 | 366 | 295 | → |
| Ferris | Village | Hancock | 160 | 169 | 158 | 126 | → |
| Fidelity | Village | Jersey | 127 | 111 | 114 | 97 | → |
| Fieldon | Village | Jersey | 277 | 271 | 244 | 171 | → |
| Fillmore | Village | Montgomery | 327 | 365 | 330 | 303 | → |
| Findlay | Village | Shelby | 787 | 711 | 684 | 669 | → |
| Fisher | Village | Champaign | 1,572 | 1,646 | 1,870 | 2,060 | → |
| Fithian | Village | Vermilion | 510 | 511 | 485 | 494 | → |
| Flanagan | Village | Livingston | 1,051 | 1,131 | 1,114 | 1,040 | → |
| Flat Rock | Village | Crawford | 421 | 429 | 331 | 324 | → |
| Flora | City | Clay | 5,235 | 5,216 | 5,067 | 4,798 | → |
| Floraville | Census-Designated Place | St. Clair | 80 | 69 | 53 | 49 | → |
| Florence | Village | Pike | 45 | 67 | 38 | 18 | → |
| Flossmoor | Village | Cook | 8,760 | 9,262 | 9,414 | 9,685 | → |
| Foosland | Village | Champaign | 132 | 90 | 101 | 75 | → |
| Ford Heights | Village | Cook | 4,277 | 3,476 | 2,772 | 1,813 | → |
| Forest City | Village | Mason | 321 | 291 | 246 | 218 | → |
| Forest Lake | Census-Designated Place | Lake | 1,203 | 1,410 | 1,561 | 1,784 | → |
| Forest Park | Village | Cook | 14,839 | 15,666 | 14,167 | 14,336 | → |
| Forest View | Village | Cook | 745 | 706 | 698 | 792 | → |
| Forrest | Village | Livingston | 1,139 | 1,230 | 1,219 | 1,044 | → |
| Forreston | Village | Ogle | 1,367 | 1,475 | 1,446 | 1,436 | → |
| Forsyth | Village | Macon | 1,738 | 2,465 | 3,487 | 3,735 | → |
| Fowler | Census-Designated Place | Adams | 139 | 120 | 120 | 154 | → |
| Fox Lake | Village | Lake / McHenry | 7,825 | 9,054 | 10,655 | 10,975 | → |
| Fox Lake Hills | Census-Designated Place | Lake | 2,511 | 2,561 | 2,591 | 2,684 | → |
| Fox River Grove | Village | McHenry / Lake | 3,635 | 4,959 | 4,765 | 4,699 | → |
| Frankfort | Village | Will / Cook | 7,441 | 10,295 | 17,789 | 20,299 | → |
| Frankfort Square | Census-Designated Place | Will | 6,886 | 9,277 | 9,276 | 8,968 | → |
| Franklin | Village | Morgan | 636 | 631 | 638 | 612 | → |
| Franklin Grove | Village | Lee | 968 | 1,077 | 1,010 | 900 | → |
| Franklin Park | Village | Cook | 18,458 | 19,483 | 18,314 | 18,468 | → |
| Franklinville | Census-Designated Place | McHenry | ... | 21 | 24 | 38 | → |
| Freeburg | Village | St. Clair | 3,348 | 3,975 | 4,401 | 4,611 | → |
| Freeman Spur | Village | Williamson / Franklin | 289 | 267 | 289 | 275 | → |
| Freeport | City | Stephenson | 26,246 | 26,389 | 25,676 | 24,030 | → |
| Fulton | City | Whiteside | 3,665 | 3,895 | 3,482 | 3,654 | → |
| Fults | Village | Monroe | 67 | 28 | 26 | 27 | → |
| Gages Lake | Census-Designated Place | Lake | 8,349 | 10,415 | 10,198 | 10,637 | → |
| Galatia | Village | Saline | 988 | 1,027 | 932 | 824 | → |
| Galena | City | Jo Daviess | 3,646 | 3,478 | 3,415 | 3,317 | → |
| Galesburg | City | Knox | 33,749 | 33,755 | 32,192 | 30,042 | → |
| Galt | Census-Designated Place | Whiteside | 148 | 173 | 133 | 193 | → |
| Galva | City | Henry | 2,770 | 2,784 | 2,587 | 2,465 | → |
| Garden Prairie | Census-Designated Place | Boone | 312 | 330 | 352 | 300 | → |
| Gardner | Village | Grundy | 1,237 | 1,439 | 1,476 | 1,363 | → |
| Garrett | Village | Douglas | 123 | 188 | 162 | 128 | → |
| Gays | Village | Moultrie | 234 | 270 | 281 | 222 | → |
| Geneseo | City | Henry | 6,025 | 6,427 | 6,623 | 6,538 | → |
| Geneva | City | Kane | 12,799 | 19,525 | 21,592 | 21,370 | → |
| Genoa | City | DeKalb | 3,312 | 4,176 | 5,178 | 5,305 | → |
| Georgetown | Census-Designated Place | McDonough | 405 | 273 | 404 | 368 | → |
| Georgetown | City | Vermilion | 3,704 | 3,550 | 3,473 | 3,143 | → |
| German Valley | Village | Stephenson | 505 | 486 | 457 | 433 | → |
| Germantown | Village | Clinton | 1,194 | 1,171 | 1,286 | 1,330 | → |
| Germantown Hills | Village | Woodford | 1,348 | 2,282 | 3,378 | 3,429 | → |
| Gibson City | City | Ford | 3,404 | 3,352 | 3,445 | 3,472 | → |
| Gifford | Village | Champaign | 579 | 827 | 978 | 910 | → |
| Gilberts | Village | Kane | 1,098 | 1,477 | 6,875 | 8,374 | → |
| Gillespie | City | Macoupin | 3,639 | 3,414 | 3,322 | 3,173 | → |
| Gilman | City | Iroquois | 1,818 | 1,833 | 1,815 | 1,747 | → |
| Gilson | Census-Designated Place | Knox | 137 | 104 | 190 | 156 | → |
| Girard | City | Macoupin | 2,181 | 2,244 | 2,099 | 1,814 | → |
| Gladstone | Village | Henderson | 274 | 287 | 281 | 234 | → |
| Glasford | Village | Peoria | 1,119 | 1,077 | 1,023 | 862 | → |
| Glasgow | Village | Scott | 163 | 173 | 141 | 111 | → |
| Glen Carbon | Village | Madison | 7,949 | 10,587 | 12,941 | 13,864 | → |
| Glen Ellyn | Village | DuPage | 27,003 | 27,164 | 27,656 | 28,997 | → |
| Glencoe | Village | Cook | 8,444 | 8,734 | 8,721 | 8,853 | → |
| Glendale Heights | Village | DuPage | 27,787 | 31,870 | 34,326 | 33,179 | → |
| Glenview | Village | Cook | 38,997 | 41,739 | 44,726 | 48,721 | → |
| Glenwood | Village | Cook | 9,373 | 8,930 | 8,985 | 8,697 | → |
| Godfrey | Village | Madison | 15,655 | 16,891 | 17,989 | 17,824 | → |
| Godley | Village | Will / Grundy | 322 | 595 | 601 | 569 | → |
| Golconda | City | Pope | 837 | 712 | 670 | 638 | → |
| Golden | Village | Adams | 565 | 623 | 642 | 649 | → |
| Golden Gate | Village | Wayne | 80 | 100 | 68 | 63 | → |
| Golf | Village | Cook | 450 | 456 | 493 | 512 | → |
| Good Hope | Village | McDonough | 421 | 426 | 396 | 362 | → |
| Goodenow | Census-Designated Place | Will | ... | ... | 68 | 60 | → |
| Goodfield | Village | Woodford / Tazewell | 486 | 542 | 866 | 948 | → |
| Goofy Ridge | Census-Designated Place | Mason | 341 | 395 | 350 | 210 | → |
| Goreville | Village | Johnson | 885 | 969 | 1,040 | 1,062 | → |
| Gorham | Village | Jackson | 305 | 256 | 236 | 171 | → |
| Grafton | City | Jersey | 918 | 626 | 679 | 632 | → |
| Grand Detour | Census-Designated Place | Ogle | 402 | 374 | 429 | 424 | → |
| Grand Ridge | Village | LaSalle | 575 | 546 | 563 | 517 | → |
| Grand Tower | City | Jackson | 763 | 622 | 603 | 478 | → |
| Grandview | Village | Sangamon | 1,637 | 1,534 | 1,438 | 1,413 | → |
| Grandwood Park | Census-Designated Place | Lake | 2,470 | 4,521 | 5,202 | 5,297 | → |
| Granite City | City | Madison | 35,598 | 32,690 | 29,753 | 27,566 | → |
| Grant Park | Village | Kankakee | 1,087 | 1,471 | 1,342 | 1,292 | → |
| Grantfork | Village | Madison | 273 | 257 | 351 | 341 | → |
| Granville | Village | Putnam | 1,407 | 1,405 | 1,429 | 1,359 | → |
| Grayslake | Village | Lake | 8,235 | 18,556 | 21,051 | 21,258 | → |
| Grayville | City | White / Edwards | 2,048 | 1,837 | 1,665 | 1,554 | → |
| Green Oaks | Village | Lake | 2,426 | 3,573 | 3,868 | 4,117 | → |
| Green Valley | Village | Tazewell | 806 | 706 | 686 | 617 | → |
| Greenfield | City | Greene | 1,172 | 1,177 | 1,071 | 1,056 | → |
| Greenup | Village | Cumberland | 1,619 | 1,554 | 1,531 | 1,369 | → |
| Greenview | Village | Menard | 848 | 862 | 778 | 748 | → |
| Greenville | City | Bond | 5,206 | 7,030 | 7,072 | 7,244 | → |
| Greenwood | Village | McHenry | 205 | 285 | 235 | 319 | → |
| Gridley | Village | McLean | 1,304 | 1,429 | 1,432 | 1,456 | → |
| Griggsville | City | Pike | 1,237 | 1,256 | 1,226 | 1,099 | → |
| Gulfport | Village | Henderson | 209 | 205 | 54 | 40 | → |
| Gurnee | Village | Lake | 14,379 | 28,810 | 31,231 | 30,716 | → |
| Hainesville | Village | Lake | 170 | 2,028 | 3,667 | 3,547 | → |
| Hamburg | Village | Calhoun | 150 | 125 | 128 | 99 | → |
| Hamel | Village | Madison | 523 | 570 | 816 | 931 | → |
| Hamilton | City | Hancock | 3,376 | 3,029 | 2,951 | 2,755 | → |
| Hamlet | Census-Designated Place | Mercer | ... | ... | ... | 21 | → |
| Hammond | Village | Piatt | 527 | 518 | 509 | 506 | → |
| Hampshire | Village | Kane | 2,256 | 3,047 | 5,561 | 7,660 | → |
| Hampton | Village | Rock Island | 1,380 | 1,512 | 1,835 | 1,778 | → |
| Hanaford | Village | Franklin | 380 | ... | 327 | 321 | → |
| Hanna City | Village | Peoria | 1,163 | 1,025 | 1,237 | 1,266 | → |
| Hanover | Village | Jo Daviess | 920 | 857 | 848 | 861 | → |
| Hanover Park | Village | DuPage / Cook | 32,906 | 38,129 | 38,215 | 37,463 | → |
| Hardin | Village | Calhoun | 1,076 | 956 | 962 | 800 | → |
| Harding | Census-Designated Place | LaSalle | 48 | 66 | 55 | 133 | → |
| Harmon | Village | Lee | 186 | 145 | 119 | 119 | → |
| Harmony | Census-Designated Place | McHenry | ... | ... | 5 | 20 | → |
| Harrisburg | City | Saline | 9,548 | 9,762 | 9,023 | 8,281 | → |
| Harrison | Census-Designated Place | Jackson | 884 | 885 | 970 | 895 | → |
| Harristown | Village | Macon | 1,333 | 1,358 | 1,371 | 1,315 | → |
| Hartford | Village | Madison | 1,683 | 1,532 | 1,428 | 1,188 | → |
| Hartland | Census-Designated Place | McHenry | ... | ... | 12 | 157 | → |
| Hartsburg | Village | Logan | 307 | 343 | 314 | 261 | → |
| Harvard | City | McHenry | 6,148 | 8,066 | 9,435 | 9,476 | → |
| Harvel | Village | Montgomery / Christian | 213 | 239 | 223 | 175 | → |
| Harvey | City | Cook | 30,060 | 30,031 | 25,265 | 20,323 | → |
| Harwood Heights | Village | Cook | 7,715 | 8,307 | 8,619 | 9,066 | → |
| Havana | City | Mason | 3,644 | 3,594 | 3,299 | 2,961 | → |
| Hawthorn Woods | Village | Lake | 4,941 | 6,310 | 7,783 | 9,067 | → |
| Hazel Crest | Village | Cook | 13,472 | 14,805 | 14,057 | 13,477 | → |
| Hebron | Village | McHenry | 838 | 1,088 | 1,200 | 1,384 | → |
| Hecker | Village | Monroe | 534 | 470 | 486 | 431 | → |
| Henderson | Village | Knox | 290 | 317 | 259 | 263 | → |
| Hennepin | Village | Putnam | 669 | 700 | 761 | 760 | → |
| Henning | Village | Vermilion | 273 | 246 | 251 | 209 | → |
| Henry | City | Marshall | 2,587 | 2,534 | 2,464 | 2,335 | → |
| Heritage Lake | Census-Designated Place | Tazewell | 413 | 1,367 | 1,520 | 1,523 | → |
| Herrick | Village | Shelby | 466 | 511 | 434 | 361 | → |
| Herrin | City | Williamson | 11,080 | 11,247 | 12,537 | 12,362 | → |
| Herscher | Village | Kankakee | 1,281 | 1,510 | 1,596 | 1,521 | → |
| Hettick | Village | Macoupin | 211 | 182 | 182 | 148 | → |
| Heyworth | Village | McLean | 1,677 | 2,514 | 2,846 | 2,795 | → |
| Hickory Hills | City | Cook | 13,066 | 13,935 | 14,049 | 14,510 | → |
| Hidalgo | Village | Jasper | 122 | 127 | 106 | 110 | → |
| Highland | City | Madison | 7,694 | 8,462 | 9,928 | 10,037 | → |
| Highland Park | City | Lake | 31,012 | 30,336 | 29,745 | 30,188 | → |
| Highwood | City | Lake | 4,362 | 4,111 | 5,450 | 5,071 | → |
| Hillcrest | Village | Ogle | 837 | 1,113 | 1,318 | 1,224 | → |
| Hillsboro | City | Montgomery | 4,380 | 4,376 | 6,211 | 5,871 | → |
| Hillsdale | Village | Rock Island | 411 | 537 | 517 | 415 | → |
| Hillside | Village | Cook | 7,657 | 8,163 | 8,162 | 8,316 | → |
| Hillview | Village | Greene | 271 | 182 | 193 | 96 | → |
| Hinckley | Village | DeKalb | 1,721 | 1,991 | 2,071 | 2,000 | → |
| Hindsboro | Village | Douglas | 341 | 361 | 311 | 277 | → |
| Hinsdale | Village | DuPage / Cook | 16,001 | 17,417 | 16,856 | 17,386 | → |
| Hodgkins | Village | Cook | 1,960 | 2,135 | 1,897 | 1,499 | → |
| Hoffman | Village | Clinton | 495 | 463 | 508 | 437 | → |
| Hoffman Estates | Village | Cook / Kane | 46,250 | 49,685 | 51,891 | 52,539 | → |
| Holcomb | Census-Designated Place | Ogle | 110 | 101 | 91 | 149 | → |
| Holiday Hills | Village | McHenry | 779 | 743 | 604 | 617 | → |
| Holiday Shores | Census-Designated Place | Madison | 1,681 | 2,318 | 2,882 | 2,840 | → |
| Hollowayville | Village | Bureau | 37 | 82 | 92 | 45 | → |
| Homer | Village | Champaign | 1,272 | 1,204 | 1,207 | 1,077 | → |
| Homer Glen | Village | Will | 17,326 | 22,301 | 24,201 | 24,543 | → |
| Hometown | City | Cook | 4,769 | 4,467 | 4,349 | 4,347 | → |
| Homewood | Village | Cook | 19,188 | 19,578 | 19,307 | 19,447 | → |
| Hoopeston | City | Vermilion | 5,836 | 5,696 | 5,353 | 4,916 | → |
| Hooppole | Village | Henry | 196 | 162 | 202 | 179 | → |
| Hopedale | Village | Tazewell | 820 | 924 | 869 | 819 | → |
| Hopewell | Village | Marshall | 354 | 383 | 412 | 421 | → |
| Hopkins Park | Village | Kankakee | 670 | 722 | 623 | 607 | → |
| Hoyleton | Village | Washington | 519 | 571 | 532 | 520 | → |
| Hudson | Village | McLean | 1,048 | 1,538 | 1,840 | 1,761 | → |
| Huey | Village | Clinton | 205 | 188 | 169 | 164 | → |
| Hull | Village | Pike | 514 | 474 | 461 | 390 | → |
| Humboldt | Village | Coles | 482 | 471 | 437 | 361 | → |
| Hume | Village | Edgar | 409 | 376 | 381 | 325 | → |
| Huntley | Village | McHenry / Kane | 2,863 | 5,800 | 24,312 | 27,746 | → |
| Hurst | City | Williamson | 847 | 806 | 799 | 759 | → |
| Hutsonville | Village | Crawford | 630 | 562 | 548 | 477 | → |
| Illinois City | Census-Designated Place | Rock Island | 24 | 49 | 26 | 159 | → |
| Illiopolis | Village | Sangamon | 925 | 926 | 891 | 845 | → |
| Ina | Village | Jefferson | 509 | 2,520 | 2,333 | 1,649 | → |
| Indian Creek | Village | Lake | 208 | 223 | 545 | 534 | → |
| Indian Head Park | Village | Cook | 3,502 | 3,874 | 3,816 | 4,072 | → |
| Indianola | Village | Vermilion | 343 | 227 | 276 | 228 | → |
| Industry | Village | McDonough | 582 | 566 | 478 | 397 | → |
| Ingalls Park | Census-Designated Place | Will | 3,173 | 3,082 | 3,314 | 3,460 | → |
| Inverness | Village | Cook | 6,525 | 6,949 | 7,400 | 7,622 | → |
| Iola | Village | Clay | 163 | 171 | 141 | 100 | → |
| Ipava | Village | Fulton | 481 | 518 | 470 | 444 | → |
| Iroquois | Village | Iroquois | 199 | 205 | 154 | 134 | → |
| Irving | Village | Montgomery | 520 | 500 | 495 | 374 | → |
| Irvington | Village | Washington | 873 | 745 | 667 | 584 | → |
| Irwin | Village | Kankakee | 50 | 73 | 78 | 68 | → |
| Island Lake | Village | McHenry / Lake | 4,589 | 8,173 | 8,069 | 8,051 | → |
| Itasca | Village | DuPage | 7,005 | 8,243 | 8,688 | 9,563 | → |
| Iuka | Village | Marion | 393 | 596 | 486 | 508 | → |
| Ivesdale | Village | Champaign / Piatt | 339 | 290 | 267 | 265 | → |
| Jacksonville | City | Morgan | 19,747 | 19,070 | 19,444 | 18,281 | → |
| Janesville | Census-Designated Place | Coles / Cumberland | 40 | 24 | 51 | 76 | → |
| Jeffersonville | Village | Wayne | 311 | 371 | 364 | 356 | → |
| Jeisyville | Village | Christian | 126 | 128 | 107 | 103 | → |
| Jerome | Village | Sangamon | 1,932 | 1,769 | 1,694 | 1,691 | → |
| Jerseyville | City | Jersey | 7,536 | 8,127 | 8,465 | 8,340 | → |
| Jewett | Village | Cumberland | 203 | 238 | 225 | 197 | → |
| Johnsburg | Village | McHenry | 4,571 | 5,413 | 6,426 | 6,378 | → |
| Johnsonville | Village | Wayne | 68 | 69 | 77 | 72 | → |
| Johnston City | City | Williamson | 3,813 | 3,599 | 3,555 | 3,386 | → |
| Joliet | City | Will / Kendall | 79,046 | 108,824 | 147,307 | 150,490 | → |
| Jonesboro | City | Union | 1,816 | 1,886 | 1,831 | 1,710 | → |
| Joppa | Village | Massac | 496 | 407 | 338 | 351 | → |
| Joslin | Census-Designated Place | Rock Island | 109 | 111 | 132 | 85 | → |
| Joy | Village | Mercer | 450 | 377 | 417 | 370 | → |
| Junction | Village | Gallatin | 201 | 142 | 129 | 57 | → |
| Junction City | Village | Marion | 539 | 563 | 482 | 532 | → |
| Justice | Village | Cook | 11,113 | 12,143 | 12,915 | 12,611 | → |
| Kampsville | Village | Calhoun | 386 | 319 | 328 | 307 | → |
| Kane | Village | Greene | 456 | 468 | 438 | 295 | → |
| Kaneville | Village | Kane | 309 | 294 | 482 | 455 | → |
| Kangley | Village | LaSalle | 250 | 283 | 251 | 234 | → |
| Kankakee | City | Kankakee | 27,916 | 27,371 | 27,542 | 24,076 | → |
| Kansas | Village | Edgar | 902 | 836 | 787 | 670 | → |
| Kappa | Village | Woodford | 134 | 181 | 231 | 233 | → |
| Karnak | Village | Pulaski | 581 | 641 | 495 | 428 | → |
| Kaskaskia | Village | Randolph | 39 | 9 | 14 | 23 | → |
| Keenes | Village | Wayne | 62 | 102 | 83 | 48 | → |
| Keensburg | Village | Wabash | 240 | 265 | 210 | 178 | → |
| Keithsburg | City | Mercer | 747 | 720 | 609 | 547 | → |
| Kell | Village | Marion | 222 | 208 | 217 | 174 | → |
| Kempton | Village | Ford | 219 | 236 | 227 | 176 | → |
| Kenilworth | Village | Cook | 2,420 | 2,614 | 2,506 | 2,519 | → |
| Kenney | Village | De Witt | 390 | 373 | 327 | 306 | → |
| Kewanee | City | Henry | 13,219 | 12,907 | 12,914 | 12,504 | → |
| Keyesport | Village | Bond / Clinton | 441 | 491 | 423 | 406 | → |
| Kilbourne | Village | Mason | 356 | 378 | 302 | 269 | → |
| Kildeer | Village | Lake | 3,421 | 3,676 | 3,902 | 4,084 | → |
| Kincaid | Village | Christian | 1,360 | 1,439 | 1,506 | 1,352 | → |
| Kinderhook | Village | Pike | 278 | 255 | 216 | 188 | → |
| Kings | Census-Designated Place | Ogle | 118 | 130 | 138 | 146 | → |
| Kingston | Census-Designated Place | Adams | 24 | 17 | 16 | 20 | → |
| Kingston | Village | DeKalb | 601 | 970 | 1,164 | 1,107 | → |
| Kingston Mines | Village | Peoria | 286 | 284 | 302 | 272 | → |
| Kinmundy | City | Marion | 879 | 899 | 795 | 733 | → |
| Kinsman | Village | Grundy | 112 | 109 | 99 | 89 | → |
| Kirkland | Village | DeKalb | 1,011 | 1,166 | 1,747 | 1,649 | → |
| Kirkwood | Village | Warren | 884 | 794 | 714 | 677 | → |
| Knollwood | Census-Designated Place | Lake | 1,863 | 2,162 | 1,747 | 2,121 | → |
| Knoxville | City | Knox | 3,261 | 3,130 | 2,911 | 2,903 | → |
| La Clede | Census-Designated Place | Fayette | 27 | 89 | 87 | 113 | → |
| La Fayette | Village | Stark | 231 | 230 | 223 | 159 | → |
| La Grange | Village | Cook | 15,360 | 15,738 | 15,671 | 16,353 | → |
| La Grange Park | Village | Cook | 12,854 | 13,226 | 13,419 | 13,743 | → |
| La Harpe | City | Hancock | 1,407 | 1,389 | 1,228 | 1,177 | → |
| La Moille | Village | Bureau | 668 | 761 | 726 | 690 | → |
| La Prairie | Village | Adams | 68 | 60 | 47 | 41 | → |
| La Rose | Village | Marshall | 130 | 159 | 142 | 99 | → |
| Lacon | City | Marshall | 2,020 | 1,995 | 1,945 | 1,880 | → |
| Ladd | Village | Bureau | 1,278 | 1,315 | 1,295 | 1,264 | → |
| Lake Barrington | Village | Lake | 4,104 | 4,766 | 4,955 | 5,098 | → |
| Lake Bluff | Village | Lake | 5,521 | 6,043 | 5,682 | 5,619 | → |
| Lake Camelot | Census-Designated Place | Peoria | 814 | 1,573 | 1,686 | 1,798 | → |
| Lake Carroll | Census-Designated Place | Carroll | 288 | 554 | 734 | 852 | → |
| Lake Catherine | Census-Designated Place | Lake | 1,475 | 1,392 | 1,379 | 1,279 | → |
| Lake City | Census-Designated Place | Moultrie | 63 | 49 | 65 | 69 | → |
| Lake Forest | City | Lake | 17,785 | 20,068 | 19,379 | 19,368 | → |
| Lake Holiday | Census-Designated Place | LaSalle | 3,021 | 4,659 | 5,316 | 5,687 | → |
| Lake in the Hills | Village | McHenry | 5,937 | 23,577 | 28,946 | 28,984 | → |
| Lake Ka-Ho | Village | Macoupin | 119 | 260 | 231 | 196 | → |
| Lake of the Woods | Census-Designated Place | Champaign | 2,339 | 2,245 | 2,390 | 2,403 | → |
| Lake Petersburg | Census-Designated Place | Menard | 809 | 773 | 719 | 740 | → |
| Lake Summerset | Census-Designated Place | Winnebago / Stephenson | 1,296 | 2,061 | 2,048 | 2,342 | → |
| Lake Villa | Village | Lake | 4,159 | 6,282 | 8,631 | 8,742 | → |
| Lake Zurich | Village | Lake | 15,135 | 18,472 | 19,693 | 19,822 | → |
| Lakemoor | Village | McHenry / Lake | 1,530 | 3,119 | 6,076 | 6,186 | → |
| Lakewood | Village | McHenry | 1,864 | 2,321 | 3,809 | 4,277 | → |
| Lakewood | Census-Designated Place | Shelby | 39 | 24 | 17 | 91 | → |
| Lakewood Shores | Census-Designated Place | Will | 524 | 369 | 345 | 665 | → |
| Lanark | City | Carroll | 1,392 | 1,581 | 1,459 | 1,514 | → |
| Lane | Census-Designated Place | De Witt | 41 | 26 | 33 | 95 | → |
| Langleyville | Census-Designated Place | Christian | 273 | 343 | 432 | 391 | → |
| Lansing | Village | Cook | 28,222 | 28,281 | 28,353 | 29,079 | → |
| LaPlace | Census-Designated Place | Piatt | 296 | 279 | 259 | 239 | → |
| LaSalle | City | LaSalle | 10,097 | 9,773 | 9,665 | 9,594 | → |
| Latham | Village | Logan | 486 | 366 | 388 | 331 | → |
| Lawrence | Census-Designated Place | McHenry | 203 | 249 | 251 | 220 | → |
| Lawrenceville | City | Lawrence | 4,898 | 4,756 | 4,424 | 4,186 | → |
| Le Roy | City | McLean | 2,882 | 3,350 | 3,562 | 3,520 | → |
| Leaf River | Village | Ogle | 546 | 555 | 443 | 429 | → |
| Lebanon | City | St. Clair | 3,738 | 3,558 | 4,452 | 4,759 | → |
| Lee | Village | Lee / DeKalb | 272 | 295 | 345 | 313 | → |
| Lee Center | Census-Designated Place | Lee | 169 | 166 | 156 | 146 | → |
| Leland | Village | LaSalle | 819 | 967 | 977 | 948 | → |
| Leland Grove | City | Sangamon | 1,685 | 1,570 | 1,495 | 1,448 | → |
| Lemont | Village | Cook / DuPage / Will | 7,915 | 13,216 | 16,053 | 17,808 | → |
| Lena | Village | Stephenson | 2,655 | 2,890 | 2,914 | 2,766 | → |
| Lenzburg | Village | St. Clair | 530 | 578 | 516 | 466 | → |
| Leonore | Village | LaSalle | 134 | 114 | 130 | 123 | → |
| Lerna | Village | Coles | 301 | 342 | 283 | 221 | → |
| Lewistown | City | Fulton | 2,584 | 2,521 | 2,379 | 2,050 | → |
| Lexington | City | McLean | 1,838 | 1,975 | 2,053 | 2,095 | → |
| Liberty | Village | Adams | 541 | 522 | 523 | 541 | → |
| Libertyville | Village | Lake | 19,807 | 20,754 | 20,405 | 20,581 | → |
| Lily Lake | Village | Kane | 1,206 | 965 | 987 | 1,039 | → |
| Lima | Village | Adams | 101 | 145 | 153 | 147 | → |
| Limestone | Village | Kankakee | 1,001 | 1,097 | 1,592 | 1,550 | → |
| Lincoln | City | Logan | 15,558 | 15,270 | 14,549 | 13,287 | → |
| Lincolnshire | Village | Lake | 5,164 | 6,126 | 7,304 | 7,941 | → |
| Lincolnwood | Village | Cook | 11,354 | 12,362 | 12,590 | 13,463 | → |
| Lindenhurst | Village | Lake | 8,298 | 12,563 | 14,573 | 14,402 | → |
| Lisbon | Village | Kendall | 248 | 236 | 292 | 270 | → |
| Lisle | Village | DuPage | 18,979 | 22,160 | 22,602 | 23,710 | → |
| Litchfield | City | Montgomery | 7,159 | 6,861 | 7,143 | 6,779 | → |
| Literberry | Census-Designated Place | Morgan | 45 | 60 | 29 | 71 | → |
| Little York | Village | Warren | 349 | 290 | 326 | 281 | → |
| Littleton | Village | Schuyler | 181 | 196 | 176 | 139 | → |
| Liverpool | Village | Fulton | 129 | 123 | 129 | 94 | → |
| Livingston | Village | Madison | 928 | 823 | 853 | 765 | → |
| Loami | Village | Sangamon | 819 | 812 | 747 | 810 | → |
| Lockport | City | Will | 9,842 | 16,494 | 24,873 | 26,096 | → |
| Lockport Heights | Census-Designated Place | Will | 1,069 | 540 | 480 | 749 | → |
| Loda | Village | Iroquois | 397 | 418 | 412 | 346 | → |
| Lomax | Village | Henderson | 473 | 482 | 452 | 406 | → |
| Lombard | Village | DuPage | 39,865 | 42,341 | 43,462 | 44,509 | → |
| London Mills | Village | Fulton / Knox | 485 | 445 | 392 | 351 | → |
| Long Creek | Village | Macon | 1,238 | 1,424 | 1,332 | 1,264 | → |
| Long Grove | Village | Lake | 4,612 | 6,728 | 7,925 | 8,391 | → |
| Long Lake | Census-Designated Place | Lake | 2,681 | 3,356 | 3,515 | 3,663 | → |
| Long Point | Village | Livingston | 213 | 247 | 226 | 202 | → |
| Longview | Village | Champaign | 180 | 154 | 153 | 113 | → |
| Loraine | Village | Adams | 335 | 363 | 315 | 301 | → |
| Lorenzo | Census-Designated Place | Will | ... | ... | 80 | 26 | → |
| Lost Nation | Census-Designated Place | Ogle | 340 | 528 | 708 | 714 | → |
| Lostant | Village | LaSalle | 516 | 483 | 506 | 434 | → |
| Louisville | Village | Clay | 1,100 | 1,302 | 1,154 | 1,146 | → |
| Loves Park | City | Winnebago / Boone | 15,868 | 20,255 | 23,986 | 23,398 | → |
| Lovington | Village | Moultrie | 1,143 | 1,219 | 1,122 | 1,067 | → |
| Lowpoint | Census-Designated Place | Woodford | 82 | 76 | 95 | 148 | → |
| Ludlow | Village | Champaign | 326 | 367 | 371 | 305 | → |
| Lyndon | Village | Whiteside | 603 | 536 | 648 | 536 | → |
| Lynn Center | Census-Designated Place | Henry | 30 | 40 | 28 | 85 | → |
| Lynnville | Village | Morgan | 147 | 137 | 119 | 95 | → |
| Lynwood | Village | Cook | 7,352 | 7,979 | 9,026 | 9,104 | → |
| Lyons | Village | Cook | 9,833 | 10,264 | 10,733 | 10,815 | → |
| Macedonia | Village | Hamilton / Franklin | 58 | 59 | 65 | 29 | → |
| Machesney Park | Village | Winnebago | 18,943 | 20,817 | 23,502 | 22,941 | → |
| Mackinaw | Village | Tazewell | 1,262 | 1,438 | 1,936 | 1,886 | → |
| Macomb | City | McDonough | 20,068 | 18,554 | 19,301 | 15,071 | → |
| Macon | City | Macon | 1,333 | 1,278 | 1,153 | 1,171 | → |
| Madison | City | Madison / St. Clair | 5,353 | 4,539 | 3,901 | 3,144 | → |
| Maeystown | Village | Monroe | 116 | 138 | 159 | 151 | → |
| Magnolia | Village | Putnam | 261 | 279 | 260 | 258 | → |
| Mahomet | Village | Champaign | 4,262 | 5,910 | 7,290 | 9,405 | → |
| Makanda | Village | Jackson | 445 | 436 | 559 | 540 | → |
| Malden | Village | Bureau | 380 | 343 | 362 | 318 | → |
| Malta | Village | DeKalb | 871 | 956 | 1,178 | 1,145 | → |
| Manchester | Village | Scott | 347 | 354 | 292 | 273 | → |
| Manhattan | Village | Will | 2,205 | 3,495 | 7,051 | 9,387 | → |
| Manito | Village | Mason | 1,711 | 1,711 | 1,647 | 1,555 | → |
| Manlius | Village | Bureau | 365 | 357 | 359 | 298 | → |
| Mansfield | Village | Piatt | 943 | 948 | 999 | 934 | → |
| Manteno | Village | Kankakee | 3,760 | 6,494 | 9,185 | 9,205 | → |
| Maple Park | Village | DeKalb / Kane | 642 | 778 | 1,308 | 1,431 | → |
| Mapleton | Village | Peoria | 243 | 250 | 273 | 258 | → |
| Maquon | Village | Knox | 331 | 316 | 282 | 223 | → |
| Marcelline | Census-Designated Place | Adams | 35 | 48 | 44 | 75 | → |
| Marengo | City | McHenry | 4,815 | 6,613 | 7,664 | 7,566 | → |
| Marietta | Village | Fulton | 142 | 149 | 113 | 102 | → |
| Marine | Village | Madison | 972 | 811 | 973 | 910 | → |
| Marion | City | Williamson | 14,896 | 15,960 | 17,210 | 16,848 | → |
| Marissa | Village | St. Clair | 2,359 | 2,165 | 1,978 | 1,833 | → |
| Mark | Village | Putnam | 395 | 496 | 568 | 517 | → |
| Markham | City | Cook | 13,125 | 12,669 | 12,533 | 11,664 | → |
| Marley | Census-Designated Place | Will | 95 | 90 | 114 | 128 | → |
| Maroa | City | Macon | 1,595 | 1,698 | 1,801 | 1,579 | → |
| Marquette Heights | City | Tazewell | 3,092 | 2,801 | 2,817 | 2,542 | → |
| Marseilles | City | LaSalle | 4,851 | 4,645 | 5,099 | 4,841 | → |
| Marshall | City | Clark | 3,626 | 3,979 | 3,950 | 3,960 | → |
| Martinsville | City | Clark | 1,215 | 1,218 | 1,166 | 1,115 | → |
| Martinton | Village | Iroquois | 302 | 370 | 381 | 336 | → |
| Maryville | Village | Madison | 4,061 | 5,659 | 7,545 | 8,260 | → |
| Mascoutah | City | St. Clair | 5,656 | 5,679 | 7,618 | 8,799 | → |
| Mason | Town | Effingham | 387 | 410 | 345 | 325 | → |
| Mason City | City | Mason | 2,441 | 2,528 | 2,343 | 2,075 | → |
| Matherville | Village | Mercer | 708 | 772 | 720 | 710 | → |
| Matteson | Village | Cook | 11,740 | 12,964 | 19,030 | 19,073 | → |
| Mattoon | City | Coles | 18,597 | 18,437 | 18,565 | 16,894 | → |
| Maunie | Village | White | 155 | 177 | 139 | 96 | → |
| Maywood | Village | Cook | 27,139 | 26,924 | 24,102 | 23,517 | → |
| Mazon | Village | Grundy | 773 | 902 | 1,015 | 981 | → |
| McClure | Village | Alexander | 305 | 289 | 402 | 255 | → |
| McCook | Village | Cook | 266 | 255 | 228 | 250 | → |
| McCullom Lake | Village | McHenry | 1,054 | 1,012 | 1,053 | 984 | → |
| McHenry | City | McHenry | 16,674 | 21,497 | 27,025 | 27,323 | → |
| McLean | Village | McLean | 823 | 809 | 832 | 741 | → |
| McLeansboro | City | Hamilton | 2,755 | 2,960 | 2,883 | 2,649 | → |
| McNabb | Village | Putnam | 310 | 310 | 285 | 280 | → |
| Mechanicsburg | Village | Sangamon | 531 | 464 | 590 | 662 | → |
| Media | Village | Henderson | 146 | 134 | 107 | 118 | → |
| Medora | Village | Macoupin | 420 | 521 | 419 | 372 | → |
| Melrose Park | Village | Cook | 20,966 | 23,144 | 25,411 | 24,801 | → |
| Melvin | Village | Ford | 460 | 487 | 452 | 418 | → |
| Mendon | Village | Adams | 844 | 1,079 | 970 | 871 | → |
| Mendota | City | LaSalle | 7,034 | 7,279 | 7,380 | 7,059 | → |
| Menominee | Village | Jo Daviess | 216 | 226 | 254 | 210 | → |
| Meredosia | Village | Morgan | 1,144 | 1,046 | 1,046 | 819 | → |
| Merrionette Park | Village | Cook | 2,090 | 1,999 | 1,900 | 1,969 | → |
| Merritt | Census-Designated Place | Scott | 23 | 21 | 16 | 48 | → |
| Metamora | Village | Woodford | 2,550 | 2,782 | 3,668 | 3,904 | → |
| Metcalf | Village | Edgar | 227 | 220 | 188 | 138 | → |
| Metropolis | City | Massac | 6,814 | 6,624 | 6,583 | 5,968 | → |
| Mettawa | Village | Lake | 391 | 385 | 539 | 533 | → |
| Meyer | Census-Designated Place | Adams | 52 | 28 | 14 | 18 | → |
| Middletown | Village | Logan | 437 | 453 | 322 | 328 | → |
| Midlothian | Village | Cook | 14,401 | 14,428 | 14,815 | 14,312 | → |
| Milan | Village | Rock Island | 5,597 | 5,507 | 5,178 | 5,103 | → |
| Milford | Village | Iroquois | 1,463 | 1,396 | 1,319 | 1,163 | → |
| Mill Creek | Village | Union | 87 | 78 | 67 | 58 | → |
| Mill Shoals | Village | White / Wayne | 253 | 238 | 208 | 178 | → |
| Millbrook | Village | Kendall | ... | 323 | 306 | 276 | → |
| Milledgeville | Village | Carroll | 1,076 | 1,040 | 1,036 | 1,025 | → |
| Millersburg | Census-Designated Place | Mercer | 84 | 87 | 89 | 54 | → |
| Millington | Village | LaSalle / Kendall | 470 | 463 | 668 | 619 | → |
| Millstadt | Village | St. Clair | 2,644 | 2,921 | 4,006 | 4,082 | → |
| Milton | Village | Pike | 270 | 287 | 271 | 210 | → |
| Mineral | Village | Bureau | 250 | 273 | 237 | 206 | → |
| Minier | Village | Tazewell | 1,164 | 1,074 | 1,252 | 1,158 | → |
| Minonk | City | Woodford | 1,982 | 2,190 | 2,078 | 1,927 | → |
| Minooka | Village | Grundy / Kendall / Will | 2,916 | 4,209 | 10,959 | 12,743 | → |
| Mitchell | Census-Designated Place | Madison | 1,056 | 934 | 1,356 | 1,217 | → |
| Modesto | Village | Macoupin | 243 | 247 | 189 | 180 | → |
| Mokena | Village | Will | 7,298 | 14,286 | 18,631 | 19,884 | → |
| Moline | City | Rock Island | 43,510 | 43,561 | 43,439 | 42,983 | → |
| Momence | City | Kankakee | 3,087 | 3,182 | 3,309 | 3,247 | → |
| Monee | Village | Will | 1,140 | 2,951 | 5,121 | 5,125 | → |
| Monmouth | City | Warren | 9,549 | 9,793 | 9,421 | 8,924 | → |
| Monroe Center | Village | Ogle | 303 | 379 | 471 | 414 | → |
| Montgomery | Village | Kane / Kendall | 5,471 | 5,686 | 18,306 | 20,290 | → |
| Monticello | City | Piatt | 4,759 | 5,123 | 5,564 | 5,943 | → |
| Montrose | Village | Effingham / Cumberland | 306 | 247 | 202 | 217 | → |
| Moro | Census-Designated Place | Madison | 172 | 138 | 131 | 397 | → |
| Morris | City | Grundy | 10,334 | 11,941 | 13,637 | 14,203 | → |
| Morrison | City | Whiteside | 4,551 | 4,440 | 4,191 | 4,079 | → |
| Morrisonville | Village | Christian | 1,110 | 1,047 | 1,061 | 997 | → |
| Morton | Village | Tazewell | 13,888 | 15,251 | 16,353 | 17,196 | → |
| Morton Grove | Village | Cook | 22,364 | 22,415 | 23,241 | 25,295 | → |
| Mossville | Census-Designated Place | Peoria | 301 | 252 | 326 | 268 | → |
| Mound City | City | Pulaski | 757 | 694 | 595 | 523 | → |
| Mound Station | Village | Brown | 147 | 124 | 122 | 117 | → |
| Mounds | City | Pulaski | 1,410 | 1,115 | 810 | 657 | → |
| Mount Auburn | Village | Christian | 544 | 519 | 482 | 454 | → |
| Mount Carmel | City | Wabash | 8,329 | 8,086 | 7,299 | 7,005 | → |
| Mount Carroll | City | Carroll | 1,755 | 1,862 | 1,717 | 1,482 | → |
| Mount Clare | Village | Macoupin | 297 | 413 | 281 | 313 | → |
| Mount Erie | Village | Wayne | 137 | 104 | 85 | 97 | → |
| Mount Morris | Village | Ogle | 2,903 | 3,043 | 3,009 | 2,854 | → |
| Mount Olive | City | Macoupin | 2,139 | 2,167 | 2,103 | 2,016 | → |
| Mount Prospect | Village | Cook | 53,091 | 55,712 | 55,037 | 56,862 | → |
| Mount Pulaski | City | Logan | 1,694 | 1,700 | 1,563 | 1,537 | → |
| Mount Sterling | City | Brown | 1,940 | 2,085 | 2,016 | 2,008 | → |
| Mount Vernon | City | Jefferson | 17,341 | 16,331 | 15,203 | 14,611 | → |
| Mount Zion | Village | Macon | 4,532 | 4,880 | 5,842 | 6,023 | → |
| Moweaqua | Village | Shelby / Christian | 1,824 | 1,952 | 1,829 | 1,761 | → |
| Muddy | Village | Saline | 92 | 90 | 69 | 59 | → |
| Mulberry Grove | Village | Bond | 662 | 676 | 632 | 521 | → |
| Mulkeytown | Census-Designated Place | Franklin | 189 | 152 | 175 | 162 | → |
| Muncie | Village | Vermilion | 182 | 157 | 146 | 156 | → |
| Mundelein | Village | Lake | 21,497 | 30,834 | 30,987 | 31,576 | → |
| Murphysboro | City | Jackson | 9,244 | 13,336 | 7,969 | 7,089 | → |
| Murrayville | Village | Morgan | 673 | 644 | 587 | 564 | → |
| Nachusa | Census-Designated Place | Lee | 180 | 105 | 142 | 137 | → |
| Naperville | City | DuPage / Will | 87,320 | 128,396 | 142,175 | 149,566 | → |
| Naplate | Village | LaSalle | 616 | 510 | 496 | 420 | → |
| Naples | Town | Scott | 130 | 137 | 130 | 101 | → |
| Nashville | City | Washington | 3,238 | 3,308 | 3,262 | 3,105 | → |
| Nason | City | Jefferson | 235 | 235 | 234 | 200 | → |
| Nauvoo | City | Hancock | 1,114 | 1,045 | 1,149 | 944 | → |
| Nebo | Village | Pike | 402 | 403 | 340 | 279 | → |
| Nekoma | Census-Designated Place | Henry | ... | ... | 3 | 23 | → |
| Nelson | Village | Lee | 174 | 165 | 170 | 128 | → |
| Neoga | City | Cumberland | 1,684 | 1,913 | 1,636 | 1,400 | → |
| Neponset | Village | Bureau | 536 | 522 | 473 | 423 | → |
| New Athens | Village | St. Clair | 2,011 | 1,985 | 2,062 | 1,953 | → |
| New Baden | Village | Clinton / St. Clair | 2,722 | 2,960 | 3,353 | 3,427 | → |
| New Bedford | Village | Bureau | 99 | 100 | 75 | 77 | → |
| New Berlin | Village | Sangamon | 793 | 1,052 | 1,348 | 1,380 | → |
| New Boston | City | Mercer | 620 | 625 | 688 | 616 | → |
| New Burnside | Village | Johnson | 259 | 228 | 211 | 152 | → |
| New Canton | Town | Pike | 405 | 420 | 359 | 333 | → |
| New Douglas | Village | Madison | 387 | 343 | 319 | 346 | → |
| New Grand Chain | Village | Pulaski | 269 | 236 | 210 | 156 | → |
| New Haven | Village | Gallatin / White | 459 | 487 | 436 | 399 | → |
| New Holland | Village | Logan | 330 | 309 | 283 | 273 | → |
| New Lenox | Village | Will | 11,804 | 18,725 | 24,296 | 27,206 | → |
| New Milford | Village | Winnebago | 1,136 | 749 | 876 | 803 | → |
| New Minden | Village | Washington | 219 | 205 | 215 | 166 | → |
| New Salem | Village | Pike | 147 | 138 | 137 | 121 | → |
| Newark | Village | Kendall | 853 | 890 | 979 | 974 | → |
| Newman | City | Douglas | 960 | 970 | 863 | 778 | → |
| Newton | City | Jasper | 3,211 | 3,085 | 2,891 | 2,784 | → |
| Niantic | Village | Macon | 655 | 736 | 707 | 610 | → |
| Niles | Village | Cook | 28,716 | 29,912 | 29,847 | 30,905 | → |
| Nilwood | Town | Macoupin | 238 | 286 | 239 | 201 | → |
| Niota | Census-Designated Place | Hancock | 163 | 98 | 119 | 114 | → |
| Noble | Village | Richland | 756 | 746 | 674 | 631 | → |
| Nokomis | City | Montgomery | 2,589 | 2,375 | 2,253 | 2,188 | → |
| Nora | Village | Jo Daviess | 161 | 119 | 121 | 111 | → |
| Normal | Town | McLean | 40,148 | 45,505 | 52,555 | 53,017 | → |
| Norridge | Village | Cook | 14,449 | 14,664 | 14,564 | 15,260 | → |
| Norris | Village | Fulton | 207 | 193 | 209 | 174 | → |
| Norris City | Village | White | 1,339 | 1,069 | 1,249 | 1,142 | → |
| North Aurora | Village | Kane | 6,289 | 10,691 | 16,618 | 18,272 | → |
| North Barrington | Village | Lake | 2,232 | 3,077 | 3,021 | 3,140 | → |
| North Chicago | City | Lake | 35,785 | 36,004 | 32,594 | 30,762 | → |
| North City | Village | Franklin | 574 | 643 | 588 | 511 | → |
| North Henderson | Village | Mercer | 184 | 193 | 187 | 163 | → |
| North Pekin | Village | Tazewell | 1,589 | 1,467 | 1,595 | 1,476 | → |
| North Riverside | Village | Cook | 6,338 | 6,348 | 6,672 | 7,421 | → |
| North Utica | Village | LaSalle | 1,023 | 1,159 | 1,347 | 1,326 | → |
| Northbrook | Village | Cook | 32,626 | 33,478 | 33,200 | 35,266 | → |
| Northfield | Village | Cook | 4,888 | 5,589 | 5,452 | 5,745 | → |
| Northlake | City | Cook | 12,489 | 12,133 | 12,334 | 12,840 | → |
| Norwood | Village | Peoria | 449 | 423 | 470 | 438 | → |
| O'Fallon | City | St. Clair | 16,518 | 21,946 | 28,767 | 32,432 | → |
| Oak Brook | Village | DuPage | 9,117 | 8,436 | 7,955 | 8,158 | → |
| Oak Forest | City | Cook | 27,310 | 28,111 | 28,001 | 27,475 | → |
| Oak Grove | Village | Rock Island | 731 | 1,319 | 595 | 472 | → |
| Oak Lawn | Village | Cook | 56,256 | 55,272 | 56,690 | 58,367 | → |
| Oak Park | Village | Cook | 53,696 | 52,518 | 51,878 | 54,773 | → |
| Oak Run | Census-Designated Place | Knox | 367 | 503 | 547 | 721 | → |
| Oakbrook Terrace | City | DuPage | 2,054 | 2,526 | 2,121 | 2,752 | → |
| Oakdale | Village | Washington | 255 | 221 | 210 | 198 | → |
| Oakford | Village | Menard | 246 | 307 | 286 | 235 | → |
| Oakland | City | Coles | 1,001 | 1,008 | 874 | 736 | → |
| Oakwood | Village | Vermilion | 1,541 | 1,511 | 1,593 | 1,326 | → |
| Oakwood Hills | Village | McHenry | 1,679 | 2,124 | 2,076 | 2,073 | → |
| Oblong | Village | Crawford | 1,727 | 1,565 | 1,468 | 1,370 | → |
| Oconee | Village | Shelby | 201 | 202 | 180 | 140 | → |
| Odell | Village | Livingston | 1,030 | 1,017 | 1,039 | 1,006 | → |
| Odin | Village | Marion | 1,179 | 1,105 | 1,076 | 938 | → |
| Ogden | Village | Champaign | 676 | 772 | 821 | 734 | → |
| Oglesby | City | LaSalle | 3,599 | 3,605 | 3,805 | 3,703 | → |
| Ohio | Village | Bureau | 502 | 542 | 513 | 470 | → |
| Ohlman | Village | Montgomery | 136 | ... | 135 | 110 | → |
| Okawville | Village | Washington | 1,280 | 1,349 | 1,434 | 1,368 | → |
| Old Mill Creek | Village | Lake | 168 | 198 | 173 | 163 | → |
| Old Ripley | Village | Bond | 95 | 129 | 108 | 83 | → |
| Old Shawneetown | Village | Gallatin | 356 | 287 | 192 | 110 | → |
| Olive Branch | Census-Designated Place | Alexander | 767 | 821 | 864 | 650 | → |
| Olivet | Census-Designated Place | Vermilion | 428 | 390 | 428 | 336 | → |
| Olmsted | Village | Pulaski | 388 | 330 | 333 | 286 | → |
| Olney | City | Richland | 8,985 | 8,765 | 9,097 | 8,703 | → |
| Olympia Fields | Village | Cook | 4,269 | 4,708 | 4,921 | 4,725 | → |
| Omaha | Village | Gallatin | 273 | 263 | 266 | 218 | → |
| Onarga | Village | Iroquois | 1,266 | 1,429 | 1,374 | 1,345 | → |
| Oneida | City | Knox | 723 | 764 | 702 | 698 | → |
| Opdyke | Census-Designated Place | Jefferson | 208 | 160 | 254 | 236 | → |
| Ophiem | Census-Designated Place | Henry | 45 | 29 | 62 | 123 | → |
| Oquawka | Village | Henderson | 1,444 | 1,530 | 1,371 | 1,136 | → |
| Orangeville | Village | Stephenson | 601 | 718 | 805 | 770 | → |
| Oreana | Village | Macon | 754 | 818 | 878 | 890 | → |
| Oregon | City | Ogle | 3,971 | 3,998 | 3,720 | 3,636 | → |
| Orient | City | Franklin | 428 | 307 | 356 | 329 | → |
| Orion | Village | Henry | 1,809 | 1,718 | 1,866 | 1,757 | → |
| Orland Hills | Village | Cook | 5,466 | 6,786 | 7,213 | 6,890 | → |
| Orland Park | Village | Cook / Will | 37,685 | 51,078 | 56,602 | 58,723 | → |
| Osco | Census-Designated Place | Henry | 67 | 60 | 57 | 108 | → |
| Oswego | Village | Kendall | 5,252 | 13,330 | 30,452 | 34,623 | → |
| Ottawa | City | LaSalle | 17,727 | 18,586 | 18,930 | 18,834 | → |
| Otterville | Town | Jersey | 115 | 120 | 126 | 86 | → |
| Owaneco | Village | Christian | 260 | 247 | 239 | 210 | → |
| Oxville | Census-Designated Place | Scott | ... | ... | 5 | 24 | → |
| Paderborn | Census-Designated Place | St. Clair | ... | ... | 43 | 35 | → |
| Palatine | Village | Cook | 57,527 | 66,298 | 68,551 | 67,890 | → |
| Palestine | Village | Crawford | 1,619 | 1,385 | 1,368 | 1,232 | → |
| Palmer | Village | Christian | 275 | 251 | 227 | 217 | → |
| Palmyra | Village | Macoupin | 722 | 733 | 698 | 602 | → |
| Paloma | Census-Designated Place | Adams | 77 | 66 | 78 | 114 | → |
| Palos Heights | City | Cook | 11,525 | 11,295 | 12,512 | 12,465 | → |
| Palos Hills | City | Cook | 17,785 | 17,707 | 17,480 | 18,528 | → |
| Palos Park | Village | Cook | 5,199 | 5,368 | 4,851 | 4,883 | → |
| Pana | City | Christian / Shelby | 5,920 | 6,015 | 5,845 | 5,195 | → |
| Panama | Village | Montgomery / Bond | 343 | 318 | 339 | 327 | → |
| Panola | Village | Woodford | 29 | 33 | 51 | 43 | → |
| Papineau | Village | Iroquois | 142 | 191 | 167 | 135 | → |
| Paris | City | Edgar | 9,215 | 9,244 | 8,886 | 8,301 | → |
| Park City | City | Lake | 5,001 | 6,650 | 7,569 | 7,890 | → |
| Park Forest | Village | Cook / Will | 24,702 | 23,459 | 21,970 | 21,699 | → |
| Park Ridge | City | Cook | 37,106 | 37,827 | 37,460 | 39,645 | → |
| Parkersburg | Village | Richland | 235 | 237 | 208 | 187 | → |
| Patoka | Village | Marion | 654 | 634 | 578 | 527 | → |
| Paw Paw | Village | Lee | 799 | 862 | 922 | 829 | → |
| Pawnee | Village | Sangamon | 2,382 | 2,635 | 2,778 | 2,687 | → |
| Paxton | City | Ford | 4,275 | 4,621 | 4,506 | 4,448 | → |
| Payson | Village | Adams | 1,114 | 1,068 | 1,025 | 1,027 | → |
| Pearl | Village | Pike | 177 | 184 | 138 | 107 | → |
| Pearl City | Village | Stephenson | 682 | 794 | 838 | 782 | → |
| Pecatonica | Village | Winnebago | 1,766 | 2,004 | 2,203 | 2,086 | → |
| Pekin | City | Tazewell / Peoria | 32,168 | 33,980 | 34,042 | 31,890 | → |
| Penfield | Census-Designated Place | Champaign | 181 | 175 | 193 | 151 | → |
| Peoria | City | Peoria | 113,642 | 112,964 | 115,141 | 113,264 | → |
| Peoria Heights | Village | Peoria / Tazewell | 6,948 | 6,732 | 6,079 | 5,913 | → |
| Peotone | Village | Will | 2,985 | 3,409 | 4,155 | 4,155 | → |
| Percy | Village | Randolph | 995 | 927 | 978 | 911 | → |
| Perry | Village | Pike | 491 | 438 | 397 | 315 | → |
| Peru | City | LaSalle / Bureau | 9,782 | 9,854 | 10,328 | 9,936 | → |
| Pesotum | Village | Champaign | 573 | 549 | 551 | 551 | → |
| Petersburg | City | Menard | 2,291 | 2,313 | 2,343 | 2,223 | → |
| Phillipstown | Village | White | 46 | 36 | 44 | 35 | → |
| Philo | Village | Champaign | 1,028 | 1,302 | 1,468 | 1,394 | → |
| Phoenix | Village | Cook | 2,220 | 2,205 | 1,974 | 1,708 | → |
| Pierron | Village | Bond / Madison | 548 | 634 | 587 | 460 | → |
| Pinckneyville | City | Perry | 3,664 | 5,495 | 5,632 | 5,075 | → |
| Pingree Grove | Village | Kane | 228 | 336 | 4,516 | 10,372 | → |
| Piper City | Village | Ford | 807 | 812 | 837 | 746 | → |
| Pistakee Highlands | Census-Designated Place | McHenry | 3,174 | 3,812 | 3,454 | 3,237 | → |
| Pittsburg | Village | Williamson | 602 | 580 | 572 | 570 | → |
| Pittsfield | City | Pike | 4,261 | 4,229 | 4,587 | 4,196 | → |
| Plainfield | Village | Will / Kendall | 6,701 | 14,042 | 39,881 | 44,901 | → |
| Plainville | Village | Adams | 261 | 267 | 262 | 270 | → |
| Plano | City | Kendall | 5,431 | 5,916 | 10,849 | 11,850 | → |
| Plattville | Village | Kendall | 190 | 225 | 242 | 218 | → |
| Pleasant Hill | Village | Pike | 1,032 | 1,073 | 964 | 928 | → |
| Pleasant Plains | Village | Sangamon | 704 | 772 | 803 | 810 | → |
| Plum Valley | Census-Designated Place | Will | 719 | 852 | 675 | 632 | → |
| Plymouth | Village | Hancock / McDonough | 521 | 549 | 505 | 436 | → |
| Pocahontas | Village | Bond | 778 | 731 | 790 | 696 | → |
| Polo | City | Ogle | 2,520 | 2,470 | 2,353 | 2,288 | → |
| Pontiac | City | Livingston | 11,644 | 11,978 | 11,937 | 11,219 | → |
| Pontoon Beach | Village | Madison | 4,480 | 5,886 | 5,886 | 5,863 | → |
| Pontoosuc | Village | Hancock | 339 | 168 | 143 | 101 | → |
| Poplar Grove | Village | Boone | 1,379 | 2,001 | 4,922 | 5,063 | → |
| Port Barrington | Village | Lake / McHenry | 743 | 831 | 1,513 | 1,582 | → |
| Port Byron | Village | Rock Island | 1,008 | 1,437 | 1,642 | 1,668 | → |
| Posen | Village | Cook | 4,245 | 4,730 | 6,047 | 5,594 | → |
| Potomac | Village | Vermilion | 753 | 698 | 750 | 687 | → |
| Prairie City | Village | McDonough | 497 | 450 | 377 | 409 | → |
| Prairie du Rocher | Village | Randolph | 602 | 613 | 604 | 500 | → |
| Prairie Grove | Village | McHenry | 1,035 | 986 | 1,991 | 1,959 | → |
| Prairietown | Census-Designated Place | Madison | 113 | 88 | 94 | 153 | → |
| Preemption | Census-Designated Place | Mercer | 151 | 143 | 133 | 254 | → |
| Prestbury | Census-Designated Place | Kane | 504 | 1,696 | 1,722 | 1,657 | → |
| Preston Heights | Census-Designated Place | Will | 2,235 | 2,650 | 2,925 | 2,898 | → |
| Princeton | City | Bureau | 7,514 | 7,535 | 7,919 | 7,857 | → |
| Princeville | Village | Peoria | 1,437 | 1,661 | 1,743 | 1,728 | → |
| Prophetstown | City | Whiteside | 1,896 | 2,014 | 2,078 | 1,944 | → |
| Prospect Heights | City | Cook | 15,374 | 17,048 | 16,258 | 16,050 | → |
| Pulaski | Village | Pulaski | 361 | 273 | 206 | 154 | → |
| Quincy | City | Adams | 40,719 | 40,783 | 40,717 | 39,637 | → |
| Radom | Village | Washington | 174 | 222 | 220 | 184 | → |
| Raleigh | Village | Saline | 320 | 324 | 353 | 289 | → |
| Ramsey | Village | Fayette | 975 | 1,064 | 1,037 | 913 | → |
| Rankin | Village | Vermilion | 619 | 620 | 561 | 495 | → |
| Ransom | Village | LaSalle | 435 | 409 | 384 | 311 | → |
| Rantoul | Village | Champaign | 17,448 | 12,923 | 12,956 | 12,374 | → |
| Rapids City | Village | Rock Island | 853 | 942 | 961 | 946 | → |
| Raritan | Village | Henderson | 146 | 140 | 138 | 104 | → |
| Raymond | Village | Montgomery | 841 | 923 | 1,004 | 946 | → |
| Red Bud | City | Randolph | 3,058 | 3,504 | 3,702 | 3,801 | → |
| Reddick | Village | Kankakee / Livingston | 208 | 209 | 169 | 198 | → |
| Redmon | Village | Edgar | 202 | 200 | 173 | 139 | → |
| Rentchler | Census-Designated Place | St. Clair | ... | ... | 34 | 45 | → |
| Rest Haven | Census-Designated Place | Will | 631 | 431 | 353 | 502 | → |
| Reynolds | Village | Rock Island / Mercer | 582 | 516 | 543 | 498 | → |
| Richfield | Census-Designated Place | Adams | ... | ... | 6 | 26 | → |
| Richmond | Village | McHenry | 1,135 | 1,189 | 1,864 | 2,084 | → |
| Richton Park | Village | Cook | 10,515 | 12,667 | 13,670 | 12,788 | → |
| Richview | Village | Washington | 323 | 314 | 258 | 237 | → |
| Ridge Farm | Village | Vermilion | 943 | 916 | 886 | 791 | → |
| Ridgefield | Census-Designated Place | McHenry | 66 | 172 | 174 | 210 | → |
| Ridgewood | Census-Designated Place | Will | 2,386 | 2,177 | 2,459 | 2,956 | → |
| Ridgway | Village | Gallatin | 1,103 | 988 | 875 | 849 | → |
| Ridott | Village | Stephenson | 158 | 161 | 161 | 127 | → |
| Riggston | Census-Designated Place | Scott | ... | ... | 1 | 14 | → |
| Riley | Census-Designated Place | McHenry | 17 | 26 | 30 | 10 | → |
| Ringwood | Village | McHenry | 615 | 719 | 838 | 842 | → |
| Rio | Village | Knox | 259 | 230 | 220 | 210 | → |
| Ripley | Village | Brown | 103 | 105 | 86 | 50 | → |
| Ritchie | Census-Designated Place | Will | 179 | 265 | 229 | 190 | → |
| River Forest | Village | Cook | 11,680 | 11,640 | 11,176 | 12,261 | → |
| River Grove | Village | Cook | 9,960 | 10,715 | 10,246 | 10,612 | → |
| Riverdale | Village | Cook | 13,510 | 15,046 | 13,549 | 10,662 | → |
| Riverside | Village | Cook | 8,752 | 8,843 | 8,875 | 9,303 | → |
| Riverton | Village | Sangamon | 2,678 | 3,114 | 3,466 | 3,553 | → |
| Riverwoods | Village | Lake | 3,126 | 3,867 | 3,671 | 3,793 | → |
| Roanoke | Village | Woodford | 1,933 | 2,037 | 2,077 | 1,958 | → |
| Robbins | Village | Cook | 7,535 | 6,559 | 5,341 | 4,631 | → |
| Roberts | Village | Ford | 397 | 387 | 362 | 344 | → |
| Robinson | City | Crawford | 6,986 | 8,001 | 7,713 | 7,147 | → |
| Rochelle | City | Ogle | 8,783 | 9,670 | 9,574 | 9,493 | → |
| Rochester | Village | Sangamon | 2,727 | 2,875 | 3,711 | 3,865 | → |
| Rock City | Village | Stephenson | 286 | 306 | 304 | 297 | → |
| Rock Falls | City | Whiteside | 9,788 | 9,579 | 9,402 | 8,792 | → |
| Rock Island | City | Rock Island | 40,683 | 39,616 | 38,979 | 37,103 | → |
| Rock Island Arsenal | Census-Designated Place | Rock Island | 212 | 145 | 149 | 182 | → |
| Rockbridge | Village | Greene | 159 | 192 | 169 | 180 | → |
| Rockdale | Village | Will | 1,732 | 1,878 | 1,982 | 2,009 | → |
| Rockford | City | Winnebago / Ogle | 144,061 | 151,365 | 153,311 | 148,946 | → |
| Rockport | Census-Designated Place | Pike | 40 | 34 | 20 | 67 | → |
| Rockton | Village | Winnebago | 3,819 | 5,650 | 7,779 | 7,871 | → |
| Rockwood | Village | Randolph | 52 | 53 | 44 | 32 | → |
| Rolling Meadows | City | Cook | 22,903 | 24,565 | 24,094 | 24,274 | → |
| Rome | Census-Designated Place | Peoria | 1,902 | 1,776 | 1,738 | 1,604 | → |
| Romeoville | Village | Will | 14,534 | 20,905 | 39,645 | 40,803 | → |
| Roodhouse | City | Greene | 2,139 | 2,228 | 1,814 | 1,576 | → |
| Roscoe | Village | Winnebago | 2,428 | 6,123 | 10,800 | 10,979 | → |
| Rose Hill | Village | Jasper | 78 | 73 | 80 | 85 | → |
| Roselle | Village | DuPage / Cook | 21,036 | 23,198 | 22,765 | 22,920 | → |
| Rosemont | Village | Cook | 3,991 | 4,284 | 4,343 | 3,953 | → |
| Roseville | Village | Warren | 1,151 | 1,072 | 944 | 879 | → |
| Rosewood Heights | Census-Designated Place | Madison | 3,544 | 3,523 | 4,038 | 3,971 | → |
| Rosiclare | City | Hardin | 1,378 | 1,230 | 1,160 | 990 | → |
| Rossville | Village | Vermilion | 1,334 | 1,217 | 1,335 | 1,219 | → |
| Round Lake | Village | Lake | 4,213 | 5,819 | 18,341 | 18,725 | → |
| Round Lake Beach | Village | Lake | 16,753 | 26,071 | 28,090 | 27,262 | → |
| Round Lake Heights | Village | Lake | 1,256 | 1,325 | 2,741 | 2,620 | → |
| Round Lake Park | Village | Lake | 4,121 | 6,046 | 7,458 | 7,671 | → |
| Roxana | Village | Madison | 1,665 | 1,653 | 1,523 | 1,451 | → |
| Royal | Village | Champaign | 239 | 278 | 285 | 291 | → |
| Royal Lakes | Village | Macoupin | 272 | 194 | 197 | 166 | → |
| Royalton | Village | Franklin | 1,191 | 1,129 | 1,152 | 1,067 | → |
| Ruma | Village | Randolph | 260 | 283 | 316 | 314 | → |
| Rushville | City | Schuyler | 3,270 | 3,219 | 3,190 | 2,978 | → |
| Russellville | Village | Lawrence | 133 | 121 | 92 | 95 | → |
| Rutland | Village | LaSalle | 374 | 340 | 318 | 256 | → |
| Sadorus | Village | Champaign | 449 | 431 | 411 | 400 | → |
| Sailor Springs | Village | Clay | 136 | 128 | 95 | 94 | → |
| Salem | City | Marion | 7,850 | 7,987 | 7,457 | 7,291 | → |
| Sammons Point | Village | Kankakee | ... | ... | 254 | 219 | → |
| San Jose | Village | Mason / Logan | 473 | 659 | 642 | 487 | → |
| Sandoval | Village | Marion | 1,566 | 1,433 | 1,276 | 1,157 | → |
| Sandwich | City | DeKalb / Kendall | 5,622 | 6,526 | 7,419 | 7,223 | → |
| Sauget | Village | St. Clair | 652 | 354 | 167 | 138 | → |
| Sauk Village | Village | Cook | 10,809 | 10,335 | 10,553 | 9,926 | → |
| Saunemin | Village | Livingston | 402 | 438 | 429 | 410 | → |
| Savanna | City | Carroll | 3,858 | 3,529 | 3,063 | 2,804 | → |
| Savoy | Village | Champaign | 2,825 | 4,554 | 7,292 | 8,879 | → |
| Sawyerville | Village | Macoupin | 315 | 281 | 277 | 267 | → |
| Saybrook | Village | McLean | 764 | 760 | 709 | 654 | → |
| Scales Mound | Village | Jo Daviess | 391 | 391 | 386 | 434 | → |
| Schaumburg | Village | Cook / DuPage | 68,731 | 75,390 | 74,233 | 78,723 | → |
| Schiller Park | Village | Cook | 11,244 | 11,791 | 11,793 | 11,712 | → |
| Schram City | Village | Montgomery | 640 | 595 | 588 | 570 | → |
| Sciota | Village | McDonough | 70 | 57 | 61 | 37 | → |
| Scott AFB | Census-Designated Place | St. Clair | 7,267 | 3,986 | 3,612 | 3,688 | → |
| Scottville | Village | Macoupin | 165 | 143 | 116 | 96 | → |
| Seaton | Village | Mercer | 223 | 245 | 222 | 214 | → |
| Seatonville | Village | Bureau | 259 | 303 | 314 | 323 | → |
| Secor | Village | Woodford | 394 | 382 | 376 | 340 | → |
| Seneca | Village | LaSalle / Grundy | 1,980 | 2,164 | 2,354 | 2,350 | → |
| Serena | Census-Designated Place | LaSalle | 148 | 146 | 141 | 129 | → |
| Sesser | City | Franklin | 2,145 | 2,105 | 1,931 | 1,898 | → |
| Seymour | Census-Designated Place | Champaign | 246 | 257 | 303 | 317 | → |
| Shabbona | Village | DeKalb | 806 | 970 | 927 | 867 | → |
| Shannon | Village | Carroll | 887 | 848 | 755 | 801 | → |
| Shawneetown | City | Gallatin | 1,584 | 1,410 | 1,244 | 1,055 | → |
| Sheffield | Village | Bureau | 952 | 950 | 925 | 821 | → |
| Shelbyville | City | Shelby | 5,017 | 5,024 | 4,685 | 4,666 | → |
| Sheldon | Village | Iroquois | 1,107 | 1,240 | 1,065 | 971 | → |
| Sheridan | Village | LaSalle | 1,816 | 2,429 | 2,136 | 2,426 | → |
| Sherman | Village | Sangamon | 2,093 | 2,885 | 4,152 | 4,676 | → |
| Sherrard | Village | Mercer | 699 | 916 | 642 | 694 | → |
| Shiloh | Village | St. Clair | 6,396 | 8,176 | 12,595 | 14,145 | → |
| Shipman | Town | Macoupin | 645 | 660 | 624 | 512 | → |
| Shirley | Census-Designated Place | McLean | 61 | 98 | 94 | 135 | → |
| Shorewood | Village | Will | 7,032 | 8,337 | 15,630 | 18,185 | → |
| Shumway | Village | Effingham | 243 | 225 | 201 | 188 | → |
| Sibley | Village | Ford | 359 | 335 | 279 | 286 | → |
| Sidell | Village | Vermilion | 588 | 623 | 617 | 490 | → |
| Sidney | Village | Champaign | 888 | 1,028 | 1,245 | 1,207 | → |
| Sigel | Town | Shelby | 344 | 384 | 373 | 324 | → |
| Silvis | City | Rock Island | 7,329 | 7,385 | 7,530 | 8,005 | → |
| Simpson | Village | Johnson | 82 | 58 | 60 | 44 | → |
| Sims | Village | Wayne | 338 | 280 | 252 | 170 | → |
| Skokie | Village | Cook | 59,431 | 63,274 | 64,826 | 67,824 | → |
| Sleepy Hollow | Village | Kane | 3,219 | 3,567 | 3,311 | 3,206 | → |
| Smithboro | Village | Bond | 201 | 203 | 182 | 157 | → |
| Smithfield | Village | Fulton | 282 | 234 | 230 | 189 | → |
| Smithton | Village | St. Clair | 1,676 | 2,374 | 3,738 | 4,006 | → |
| Smithville | Census-Designated Place | Peoria | 19 | 25 | 15 | 157 | → |
| Solon Mills | Census-Designated Place | McHenry | 69 | 103 | 63 | 133 | → |
| Somonauk | Village | DeKalb / LaSalle | 1,392 | 1,783 | 1,893 | 1,786 | → |
| Sorento | Village | Bond | 601 | 591 | 512 | 424 | → |
| South Barrington | Village | Cook | 2,896 | 3,770 | 4,570 | 5,074 | → |
| South Beloit | City | Winnebago | 4,533 | 5,658 | 7,853 | 7,994 | → |
| South Chicago Heights | Village | Cook | 3,654 | 3,974 | 4,143 | 4,017 | → |
| South Elgin | Village | Kane | 7,610 | 16,049 | 21,998 | 23,873 | → |
| South Holland | Village | Cook | 21,953 | 22,420 | 21,996 | 21,470 | → |
| South Jacksonville | Village | Morgan | 3,266 | 3,454 | 3,331 | 3,302 | → |
| South Pekin | Village | Tazewell | 1,184 | 1,154 | 1,150 | 989 | → |
| South Roxana | Village | Madison | 1,961 | 1,881 | 2,086 | 1,890 | → |
| South Wilmington | Village | Grundy | 678 | 654 | 681 | 706 | → |
| Southern View | Village | Sangamon | 2,012 | 1,745 | 1,662 | 1,591 | → |
| Sparland | Village | Marshall | 368 | 510 | 401 | 360 | → |
| Sparta | City | Randolph | 4,903 | 4,602 | 4,302 | 4,092 | → |
| Spaulding | Village | Sangamon | 455 | 581 | 859 | 798 | → |
| Spillertown | Village | Williamson | 212 | 212 | 204 | 180 | → |
| Spring Bay | Village | Woodford | 476 | 435 | 476 | 467 | → |
| Spring Grove | Village | McHenry | 1,851 | 4,048 | 5,781 | 5,485 | → |
| Spring Valley | City | Bureau | 5,235 | 5,468 | 5,548 | 5,587 | → |
| Springerton | Village | White | 158 | 134 | 110 | 116 | → |
| Springfield | City | Sangamon | 107,460 | 112,514 | 116,995 | 114,506 | → |
| St. Anne | Village | Kankakee | 1,223 | 1,226 | 1,278 | 1,159 | → |
| St. Augustine | Village | Knox | 151 | 148 | 121 | 117 | → |
| St. Charles | City | Kane / DuPage | 23,207 | 27,943 | 32,289 | 33,126 | → |
| St. David | Village | Fulton | 608 | 598 | 590 | 528 | → |
| St. Elmo | City | Fayette | 1,489 | 1,459 | 1,429 | 1,268 | → |
| St. Francisville | City | Lawrence | 855 | 764 | 697 | 571 | → |
| St. Jacob | Village | Madison | 764 | 977 | 1,137 | 1,374 | → |
| St. Johns | Village | Perry | 271 | 236 | 219 | 162 | → |
| St. Joseph | Village | Champaign | 2,061 | 2,895 | 3,985 | 3,809 | → |
| St. Libory | Village | St. Clair | 531 | 583 | 620 | 631 | → |
| St. Peter | Village | Fayette | 353 | 386 | 353 | 320 | → |
| St. Rose | Village | Clinton | 104 | 109 | 403 | 460 | → |
| Standard | Village | Putnam | 260 | 259 | 222 | 227 | → |
| Standard City | Village | Macoupin | 128 | 136 | 152 | 132 | → |
| Stanford | Village | McLean | 653 | 698 | 619 | 597 | → |
| Staunton | City | Macoupin | 4,812 | 5,158 | 5,228 | 5,059 | → |
| Ste. Marie | Village | Jasper | 281 | 266 | 244 | 234 | → |
| Steeleville | Village | Randolph | 2,081 | 2,057 | 2,084 | 1,925 | → |
| Steger | Village | Cook / Will | 9,361 | 9,641 | 9,546 | 9,609 | → |
| Sterling | City | Whiteside | 15,451 | 15,951 | 15,424 | 14,872 | → |
| Steward | Village | Lee | 278 | 271 | 256 | 228 | → |
| Stewardson | Village | Shelby | 661 | 758 | 736 | 720 | → |
| Stickney | Village | Cook | 5,674 | 6,150 | 6,786 | 7,115 | → |
| Stillman Valley | Village | Ogle | 860 | 1,036 | 1,120 | 1,073 | → |
| Stockton | Village | Jo Daviess | 1,899 | 1,937 | 1,869 | 1,731 | → |
| Stone Park | Village | Cook | 4,378 | 5,098 | 4,946 | 4,581 | → |
| Stonefort | Village | Saline / Williamson | 309 | 292 | 293 | 223 | → |
| Stonington | Village | Christian | 1,016 | 960 | 933 | 828 | → |
| Stoy | Village | Crawford | 135 | 121 | 130 | 107 | → |
| Strasburg | Village | Shelby | 473 | 595 | 467 | 533 | → |
| Strawn | Village | Livingston | 78 | 105 | 99 | 104 | → |
| Streamwood | Village | Cook | 31,464 | 36,490 | 39,842 | 39,597 | → |
| Streator | City | LaSalle / Livingston | 14,761 | 14,057 | 13,987 | 12,545 | → |
| Stronghurst | Village | Henderson | 799 | 893 | 883 | 819 | → |
| Sublette | Village | Lee | 397 | 456 | 449 | 380 | → |
| Sugar Grove | Village | Kane | 2,131 | 3,977 | 9,006 | 9,260 | → |
| Sullivan | City | Moultrie | 4,365 | 4,363 | 4,451 | 4,411 | → |
| Summerfield | Village | St. Clair | 499 | 468 | 431 | 344 | → |
| Summit | Village | Cook | 9,986 | 10,637 | 11,054 | 11,161 | → |
| Sumner | City | Lawrence | 1,083 | 1,011 | 3,178 | 2,640 | → |
| Sun River Terrace | Village | Kankakee | 527 | 435 | 528 | 460 | → |
| Sunnyland | Census-Designated Place | Will | 809 | 750 | 753 | 822 | → |
| Swansea | Village | St. Clair | 9,252 | 11,048 | 13,446 | 14,382 | → |
| Swedona | Census-Designated Place | Mercer | 51 | 74 | 41 | 109 | → |
| Sycamore | City | DeKalb | 10,048 | 12,075 | 17,520 | 18,685 | → |
| Symerton | Village | Will | 110 | 112 | 91 | 125 | → |
| Table Grove | Village | Fulton | 408 | 389 | 418 | 350 | → |
| Tallula | Village | Menard | 624 | 638 | 488 | 435 | → |
| Tamaroa | Village | Perry | 785 | 760 | 618 | 544 | → |
| Tamms | Village | Alexander | 723 | 719 | 1,041 | 425 | → |
| Tampico | Village | Whiteside | 829 | 776 | 790 | 693 | → |
| Taylor Ridge | Census-Designated Place | Rock Island | 45 | 53 | 121 | 141 | → |
| Taylor Springs | Village | Montgomery | 676 | 576 | 692 | 739 | → |
| Taylorville | City | Christian | 11,304 | 11,477 | 11,281 | 10,524 | → |
| Tennessee | Village | McDonough | 127 | 147 | 115 | 100 | → |
| Teutopolis | Village | Effingham | 1,479 | 1,567 | 1,543 | 1,620 | → |
| Thawville | Village | Iroquois | 241 | 254 | 242 | 215 | → |
| Thayer | Village | Sangamon | 730 | 771 | 693 | 632 | → |
| The Galena Territory | Census-Designated Place | Jo Daviess | 152 | 569 | 1,058 | 1,500 | → |
| Thebes | Village | Alexander | 461 | 455 | 434 | 208 | → |
| Third Lake | Village | Lake | 1,229 | 1,337 | 1,180 | 1,118 | → |
| Thomasboro | Village | Champaign | 1,250 | 1,219 | 1,124 | 1,034 | → |
| Thompsonville | Village | Franklin | 573 | 559 | 543 | 486 | → |
| Thomson | Village | Carroll | 457 | 452 | 590 | 1,612 | → |
| Thornton | Village | Cook | 2,539 | 2,516 | 2,388 | 2,384 | → |
| Tilden | Village | Randolph | 922 | 913 | 889 | 751 | → |
| Tilton | Village | Vermilion | 3,548 | 3,396 | 2,715 | 2,643 | → |
| Timberlane | Village | Boone | 197 | 249 | 932 | 907 | → |
| Time | Village | Pike | 36 | 29 | 23 | 26 | → |
| Tinley Park | Village | Cook / Will | 38,311 | 48,741 | 56,827 | 56,004 | → |
| Tiskilwa | Village | Bureau | 838 | 795 | 839 | 742 | → |
| Toledo | Village | Cumberland | 1,189 | 1,224 | 1,228 | 1,159 | → |
| Tolono | Village | Champaign | 2,612 | 2,740 | 3,460 | 3,597 | → |
| Toluca | City | Marshall | 1,330 | 1,343 | 1,414 | 1,347 | → |
| Tonica | Village | LaSalle | 718 | 675 | 768 | 750 | → |
| Topeka | Village | Mason | 99 | 89 | 76 | 58 | → |
| Toulon | City | Stark | 1,339 | 1,388 | 1,291 | 1,191 | → |
| Tovey | Village | Christian | 533 | 524 | 508 | 463 | → |
| Towanda | Village | McLean | 552 | 505 | 483 | 433 | → |
| Tower Hill | Village | Shelby | 601 | 615 | 611 | 483 | → |
| Tower Lakes | Village | Lake | 1,352 | 1,331 | 1,281 | 1,225 | → |
| Tremont | Village | Tazewell | 2,088 | 2,033 | 2,262 | 2,279 | → |
| Trenton | City | Clinton | 2,522 | 2,582 | 2,715 | 2,687 | → |
| Trilla | Census-Designated Place | Coles / Cumberland | 129 | 142 | 140 | 156 | → |
| Triumph | Census-Designated Place | LaSalle | 99 | 73 | 96 | 100 | → |
| Trivoli | Census-Designated Place | Peoria | 300 | 146 | 140 | 385 | → |
| Trout Valley | Village | McHenry | 580 | 574 | 531 | 512 | → |
| Troy | City | Madison | 6,420 | 8,493 | 9,913 | 11,446 | → |
| Troy Grove | Village | LaSalle | 249 | 292 | 250 | 225 | → |
| Tuscola | City | Douglas | 4,206 | 4,431 | 4,483 | 4,640 | → |
| Twin Grove | Census-Designated Place | McLean | 1,185 | 1,575 | 1,564 | 1,524 | → |
| Ullin | Village | Pulaski | 461 | 788 | 466 | 481 | → |
| Union | Village | McHenry | 542 | 577 | 580 | 551 | → |
| Union Hill | Village | Kankakee | 70 | 61 | 60 | 53 | → |
| Unity | Census-Designated Place | Alexander | 91 | 99 | 93 | 98 | → |
| University Park | Village | Will / Cook | 6,369 | 6,661 | 7,113 | 7,146 | → |
| Urbana | City | Champaign | 37,200 | 37,075 | 42,137 | 38,988 | → |
| Ursa | Village | Adams | 533 | 602 | 628 | 608 | → |
| Valier | Village | Franklin | 708 | 665 | 669 | 555 | → |
| Valley City | Village | Pike | 23 | 16 | 14 | 14 | → |
| Valmeyer | Village | Monroe | 957 | 612 | 1,251 | 1,231 | → |
| Vandalia | City | Fayette | 6,318 | 7,027 | 7,042 | 7,459 | → |
| Varna | Village | Marshall | 407 | 425 | 384 | 378 | → |
| Venedy | Village | Washington | 158 | 137 | 138 | 125 | → |
| Venetian Village | Census-Designated Place | Lake | 2,266 | 3,082 | 2,826 | 2,761 | → |
| Venice | City | Madison | 3,528 | 2,538 | 1,894 | 1,492 | → |
| Vergennes | Village | Jackson | 266 | 330 | 296 | 234 | → |
| Vermilion | Village | Edgar | 285 | 242 | 223 | 202 | → |
| Vermont | Village | Fulton | 806 | 777 | 662 | 573 | → |
| Vernon | Village | Marion | 207 | 192 | 123 | 102 | → |
| Vernon Hills | Village | Lake | 15,419 | 20,101 | 25,005 | 26,858 | → |
| Verona | Village | Grundy | 242 | 253 | 215 | 206 | → |
| Versailles | Village | Brown | 493 | 569 | 478 | 447 | → |
| Victoria | Village | Knox | 283 | 309 | 311 | 267 | → |
| Vienna | City | Johnson | 1,494 | 1,247 | 1,426 | 1,350 | → |
| Villa Grove | City | Douglas | 2,780 | 2,534 | 2,533 | 2,479 | → |
| Villa Park | Village | DuPage | 21,548 | 22,474 | 22,020 | 22,258 | → |
| Viola | Village | Mercer | 964 | 947 | 955 | 871 | → |
| Virden | City | Macoupin / Sangamon | 3,623 | 3,420 | 3,524 | 3,228 | → |
| Virgil | Village | Kane | 163 | 300 | 329 | 289 | → |
| Virginia | City | Cass | 1,799 | 1,735 | 1,615 | 1,515 | → |
| Volo | Village | Lake | 356 | 226 | 2,916 | 6,161 | → |
| Wadsworth | Village | Lake | 2,390 | 3,447 | 3,753 | 3,511 | → |
| Waggoner | Village | Montgomery | 221 | 244 | 266 | 181 | → |
| Walnut | Village | Bureau | 1,473 | 1,456 | 1,420 | 1,309 | → |
| Walnut Hill | Village | Marion | 140 | 109 | 108 | 96 | → |
| Walshville | Village | Montgomery | 73 | 89 | 64 | 62 | → |
| Waltonville | Village | Jefferson | 391 | 414 | 443 | 417 | → |
| Wamac | City | Washington / Marion / Clinton | 1,506 | 1,375 | 1,182 | 987 | → |
| Wapella | Village | De Witt | 696 | 645 | 558 | 513 | → |
| Warren | Village | Jo Daviess | 1,574 | 1,501 | 1,425 | 1,327 | → |
| Warrensburg | Village | Macon | 1,278 | 1,287 | 1,211 | 1,114 | → |
| Warrenville | City | DuPage | 11,241 | 13,465 | 13,169 | 13,560 | → |
| Warsaw | City | Hancock | 1,880 | 1,798 | 1,607 | 1,514 | → |
| Washburn | Village | Woodford / Marshall | 1,078 | 1,155 | 1,149 | 1,031 | → |
| Washington | City | Tazewell | 10,414 | 11,547 | 15,228 | 16,091 | → |
| Washington Park | Village | St. Clair | 7,428 | 5,347 | 4,196 | 2,579 | → |
| Wataga | Village | Knox | 879 | 872 | 845 | 743 | → |
| Waterloo | City | Monroe | 5,895 | 8,110 | 9,958 | 11,013 | → |
| Waterman | Village | DeKalb | 1,036 | 1,242 | 1,517 | 1,432 | → |
| Watseka | City | Iroquois | 5,445 | 5,715 | 5,289 | 4,686 | → |
| Watson | Village | Effingham | 650 | 758 | 753 | 668 | → |
| Wauconda | Village | Lake | 6,511 | 9,461 | 13,622 | 14,093 | → |
| Waukegan | City | Lake | 69,290 | 87,926 | 89,119 | 89,309 | → |
| Waverly | City | Morgan | 1,404 | 1,352 | 1,297 | 1,189 | → |
| Wayne | Village | DuPage / Kane | 1,775 | 2,176 | 2,467 | 2,282 | → |
| Wayne City | Village | Wayne | 1,117 | 1,102 | 1,032 | 1,007 | → |
| Waynesville | Village | De Witt | 518 | 450 | 427 | 380 | → |
| Wedron | Census-Designated Place | LaSalle | 140 | 142 | 166 | 140 | → |
| Weldon | Village | De Witt | 407 | 441 | 429 | 362 | → |
| Wellington | Village | Iroquois | 294 | 258 | 242 | 205 | → |
| Wenona | City | Marshall / LaSalle | 942 | 1,052 | 1,060 | 975 | → |
| Wenonah | Village | Montgomery | 25 | 44 | 37 | 29 | → |
| West Brooklyn | Village | Lee | 160 | 174 | 142 | 131 | → |
| West Chicago | City | DuPage | 16,028 | 24,033 | 27,239 | 25,624 | → |
| West City | Village | Franklin | 746 | 729 | 655 | 656 | → |
| West Dundee | Village | Kane | 3,842 | 5,420 | 7,295 | 7,727 | → |
| West Frankfort | City | Franklin | 8,757 | 8,317 | 8,175 | 7,280 | → |
| West Liberty | Census-Designated Place | Jasper | 124 | 127 | 110 | 96 | → |
| West Peoria | City | Peoria | 5,323 | 4,787 | 4,699 | 4,270 | → |
| West Point | Village | Hancock | 214 | 196 | 183 | 142 | → |
| West Salem | Village | Edwards | 1,042 | 1,011 | 897 | 779 | → |
| West Union | Census-Designated Place | Clark | 210 | 176 | 288 | 271 | → |
| West York | Census-Designated Place | Crawford | 164 | 112 | 129 | 74 | → |
| Westchester | Village | Cook | 17,304 | 16,816 | 16,718 | 16,895 | → |
| Western Springs | Village | Cook | 11,962 | 12,467 | 12,946 | 13,623 | → |
| Westervelt | Census-Designated Place | Shelby | 121 | 130 | 128 | 131 | → |
| Westfield | Village | Clark | 676 | 678 | 601 | 536 | → |
| Westlake Village | Census-Designated Place | Winnebago | ... | 225 | 1,373 | 1,493 | → |
| Westmont | Village | DuPage | 22,243 | 25,081 | 24,666 | 24,464 | → |
| Westville | Village | Vermilion | 3,333 | 3,172 | 3,202 | 3,176 | → |
| Wheaton | City | DuPage | 51,889 | 55,339 | 53,170 | 54,012 | → |
| Wheeler | Village | Jasper | 161 | 131 | 147 | 97 | → |
| Wheeling | Village | Cook / Lake | 31,408 | 36,256 | 37,644 | 39,186 | → |
| White City | Village | Macoupin | 225 | 207 | 228 | 211 | → |
| White Hall | City | Greene | 2,818 | 2,637 | 2,511 | 2,281 | → |
| White Heath | Census-Designated Place | Piatt | 232 | 298 | 290 | 251 | → |
| Whiteash | Census-Designated Place | Williamson | 233 | 242 | 241 | 279 | → |
| Williamsfield | Village | Knox | 571 | 607 | 578 | 572 | → |
| Williamson | Village | Madison | 278 | 255 | 228 | 180 | → |
| Williamsville | Village | Sangamon | 1,135 | 1,438 | 1,473 | 1,437 | → |
| Willisville | Village | Perry | 579 | 711 | 633 | 579 | → |
| Willow Hill | Village | Jasper | 277 | 251 | 230 | 171 | → |
| Willow Lake | Census-Designated Place | Stephenson | 1,179 | 1,174 | 1,117 | 1,026 | → |
| Willow Springs | Village | Cook | 4,707 | 4,954 | 5,751 | 5,872 | → |
| Willowbrook | Village | DuPage | 8,912 | 8,766 | 8,675 | 9,238 | → |
| Willowbrook | Census-Designated Place | Will | 1,089 | 1,278 | 1,401 | 1,346 | → |
| Wilmette | Village | Cook | 26,751 | 27,605 | 27,060 | 28,173 | → |
| Wilmington | Village | Greene | 129 | 131 | 142 | 90 | → |
| Wilmington | City | Will | 5,154 | 5,198 | 5,749 | 5,661 | → |
| Wilsonville | Village | Macoupin | 611 | 606 | 586 | 541 | → |
| Wilton Center | Census-Designated Place | Will | 80 | 13 | 28 | 122 | → |
| Winchester | City | Scott | 1,820 | 1,665 | 1,593 | 1,576 | → |
| Windsor | Village | Mercer | 774 | 722 | 748 | 672 | → |
| Windsor | City | Shelby | 1,134 | 1,179 | 1,187 | 1,073 | → |
| Winfield | Village | DuPage | 7,123 | 8,862 | 9,064 | 9,829 | → |
| Winnebago | Village | Winnebago | 1,875 | 2,965 | 3,138 | 2,931 | → |
| Winnetka | Village | Cook | 12,068 | 12,584 | 12,194 | 12,741 | → |
| Winslow | Village | Stephenson | 319 | 343 | 340 | 283 | → |
| Winthrop Harbor | Village | Lake | 6,276 | 6,717 | 6,860 | 6,596 | → |
| Witt | City | Montgomery | 980 | 991 | 898 | 788 | → |
| Wonder Lake | Village | McHenry | 2,787 | 2,882 | 4,029 | 3,977 | → |
| Wood Dale | City | DuPage | 12,829 | 13,539 | 13,752 | 14,067 | → |
| Wood River | City | Madison | 12,530 | 12,037 | 10,635 | 10,455 | → |
| Woodhull | Village | Henry | 796 | 810 | 813 | 755 | → |
| Woodland | Village | Iroquois | 315 | 321 | 317 | 248 | → |
| Woodlawn | Village | Jefferson | 624 | 667 | 694 | 623 | → |
| Woodridge | Village | DuPage / Will | 26,743 | 30,875 | 32,989 | 34,153 | → |
| Woodson | Village | Morgan | 482 | 550 | 513 | 498 | → |
| Woodstock | City | McHenry | 14,601 | 20,096 | 24,789 | 25,676 | → |
| Worden | Village | Madison | 910 | 896 | 1,071 | 1,095 | → |
| Worth | Village | Cook | 11,217 | 10,880 | 10,792 | 10,975 | → |
| Wyanet | Village | Bureau | 1,015 | 1,024 | 986 | 883 | → |
| Wyoming | City | Stark | 1,477 | 1,452 | 1,429 | 1,299 | → |
| Xenia | Village | Clay | 425 | 401 | 395 | 385 | → |
| Yale | Village | Jasper | 94 | 105 | 86 | 67 | → |
| Yates City | Village | Knox | 664 | 628 | 691 | 653 | → |
| Yorkville | City | Kendall | 5,367 | 7,354 | 16,952 | 21,617 | → |
| Zeigler | City | Franklin | 1,746 | 1,669 | 1,778 | 1,487 | → |
| Zion | City | Lake | 19,891 | 23,313 | 24,398 | 24,782 | → |
Source: U.S. Census Bureau.
Explanation: Latest available rebased population figures are used. In case of significant changes, they were recalculated by using census block data.