| Name | Status | Population census 1990-04-01 | Population census 2000-04-01 | Population census 2010-04-01 | |
|---|---|---|---|---|---|
| Butler | County | 152,013 | 174,105 | 183,862 | o |
| Pennsylvania | Federal State | 11,882,842 | 12,280,548 | 12,702,379 |
| Name | Status | Population census 1990-04-01 | Population census 2000-04-01 | Population census 2010-04-01 | |
|---|---|---|---|---|---|
| Bruin | Borough | 635 | 534 | 524 | o |
| Butler | City | 15,724 | 15,121 | 13,757 | o |
| Callery | Borough | 422 | 444 | 394 | o |
| Cherry Valley | Borough | 101 | 72 | 66 | o |
| Chicora | Borough | 1,077 | 1,021 | 1,043 | o |
| Connoquenessing | Borough | 499 | 564 | 528 | o |
| East Butler | Borough | 743 | 679 | 732 | o |
| Eau Claire | Borough | 371 | 355 | 316 | o |
| Evans City | Borough | 2,065 | 2,009 | 1,833 | o |
| Fairview | Borough | 218 | 220 | 198 | o |
| Fernway | Census-Designated Place | 9,072 | 12,188 | 12,414 | o |
| Fox Run | Census-Designated Place | 2,384 | 3,044 | 3,282 | o |
| Harmony | Borough | 1,016 | 937 | 890 | o |
| Harrisville | Borough | 862 | 883 | 897 | o |
| Homeacre-Lyndora | Census-Designated Place | 7,511 | 6,685 | 6,906 | o |
| Karns City | Borough | 226 | 244 | 209 | o |
| Lake Arthur Estates | Census-Designated Place | ... | ... | 594 | o |
| Mars | Borough | 1,735 | 1,746 | 1,699 | o |
| Meadowood | Census-Designated Place | 3,011 | 2,912 | 2,693 | o |
| Meridian | Census-Designated Place | 3,473 | 3,794 | 3,881 | o |
| Nixon | Census-Designated Place | 1,342 | 1,404 | 1,373 | o |
| Oak Hills | Census-Designated Place | 2,245 | 2,335 | 2,333 | o |
| Petrolia | Borough | 307 | 218 | 212 | o |
| Portersville | Borough | 393 | 268 | 235 | o |
| Prospect | Borough | 1,106 | 1,234 | 1,169 | o |
| Saxonburg | Borough | 1,169 | 1,629 | 1,525 | o |
| Seven Fields | Borough | 558 | 1,986 | 2,887 | o |
| Shanor-Northvue | Census-Designated Place | 3,517 | 4,825 | 5,051 | o |
| Slippery Rock | Borough | 2,975 | 3,065 | 3,625 | o |
| Slippery Rock University | Census-Designated Place | ... | ... | 1,898 | o |
| Unionville | Census-Designated Place | ... | ... | 962 | o |
| Valencia | Borough | 396 | 384 | 551 | o |
| West Liberty | Borough | 278 | 325 | 343 | o |
| West Sunbury | Borough | 174 | 104 | 192 | o |
| Zelienople | Borough | 4,161 | 4,123 | 3,812 | o |
Source: US Census Bureau (web).
2011-04-03WWW.CITYPOPULATION.DE