St. Clair
County in Illinois
County
The population development of St. Clair.
| Name | Status | Population Census 1990-04-01 | Population Census 2000-04-01 | Population Census 2010-04-01 | Population Census 2020-04-01 | Population Estimate 2023-07-01 | |
|---|---|---|---|---|---|---|---|
| St. Clair | County | 262,852 | 256,082 | 270,056 | 257,412 | 251,018 | → |
| Illinois | State | 11,430,602 | 12,419,293 | 12,830,632 | 12,813,469 | 12,549,689 |
Contents: Incorporated Places
The population development of the incorporated places in St. Clair.
icon links to further information about a selected place including its population structure (gender, age groups, age distribution, urbanization, »race«, ethnicity).| Name | Status | County | Population Census 1990-04-01 | Population Census 2000-04-01 | Population Census 2010-04-01 | Population Census 2020-04-01 | Population Estimate 2023-07-01 | |
|---|---|---|---|---|---|---|---|---|
| Belleville | City | St. Clair | 43,120 | 42,183 | 44,239 | 42,375 | 40,726 | → |
| Brooklyn | Village | St. Clair | 1,144 | 665 | 743 | 651 | 626 | → |
| Cahokia Heights (incl. Centreville, Cahokia, Alorton) | City | St. Clair | 28,052 | 25,028 | 22,597 | 17,904 | 17,114 | → |
| Caseyville | Village | St. Clair | 5,042 | 4,589 | 4,209 | 4,394 | 4,359 | → |
| Collinsville | City | Madison / St. Clair | 23,006 | 24,673 | 25,591 | 24,368 | 23,779 | → |
| Columbia | City | Monroe / St. Clair | 6,089 | 7,875 | 9,698 | 11,011 | 10,933 | → |
| Dupo | Village | St. Clair / Monroe | 3,849 | 4,021 | 4,179 | 3,987 | 3,821 | → |
| East Carondelet | Village | St. Clair | 630 | 298 | 506 | 391 | 375 | → |
| East St. Louis | City | St. Clair | 40,871 | 31,667 | 26,938 | 18,462 | 17,642 | → |
| Fairmont City | Village | St. Clair / Madison | 2,125 | 2,431 | 2,645 | 2,261 | 2,174 | → |
| Fairview Heights | City | St. Clair | 14,952 | 14,981 | 17,065 | 16,714 | 16,125 | → |
| Fayetteville | Village | St. Clair | 303 | 383 | 366 | 294 | 286 | → |
| Freeburg | Village | St. Clair | 3,348 | 3,975 | 4,401 | 4,590 | 4,501 | → |
| Lebanon | City | St. Clair | 3,738 | 3,558 | 4,452 | 4,690 | 4,571 | → |
| Lenzburg | Village | St. Clair | 530 | 578 | 516 | 468 | 451 | → |
| Madison | City | Madison / St. Clair | 5,353 | 4,539 | 3,901 | 3,144 | 3,065 | → |
| Marissa | Village | St. Clair | 2,359 | 2,165 | 1,978 | 1,833 | 1,752 | → |
| Mascoutah | City | St. Clair | 5,656 | 5,679 | 7,618 | 8,753 | 8,916 | → |
| Millstadt | Village | St. Clair | 2,644 | 2,921 | 4,006 | 4,074 | 3,943 | → |
| New Athens | Village | St. Clair | 2,011 | 1,985 | 2,062 | 1,952 | 1,873 | → |
| New Baden | Village | Clinton / St. Clair | 2,722 | 2,960 | 3,353 | 3,425 | 3,364 | → |
| O'Fallon | City | St. Clair | 16,518 | 21,946 | 28,767 | 32,327 | 31,968 | → |
| Sauget | Village | St. Clair | 652 | 354 | 167 | 138 | 132 | → |
| Shiloh | Village | St. Clair | 6,396 | 8,176 | 12,595 | 14,116 | 14,736 | → |
| Smithton | Village | St. Clair | 1,676 | 2,374 | 3,738 | 4,007 | 3,900 | → |
| St. Libory | Village | St. Clair | 531 | 583 | 620 | 631 | 610 | → |
| Summerfield | Village | St. Clair | 499 | 468 | 431 | 344 | 332 | → |
| Swansea | Village | St. Clair | 9,252 | 11,048 | 13,446 | 14,380 | 14,472 | → |
| Washington Park | Village | St. Clair | 7,428 | 5,347 | 4,196 | 2,579 | 2,493 | → |
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.