There are 44 cities in Butler County, Pennsylvania.
Note: As defined by the US Census Bureau, a city's official boundaries often extend miles beyond the city itself and may even cross county lines. As such, several thousand US cities officially exist in two or more counties (and therefore appear on multiple counties' lists of cities.)
City | Rank | State | 2024 Population | 2020 Census | Annual Change | Density (mi²) | Area (mi²) |
|---|---|---|---|---|---|---|---|
| Allison Park | 1 | Pennsylvania | 22,779 | 22,623 | 0.17% | 1,644 | 13.86 |
| Butler | 2 | Pennsylvania | 12,970 | 13,484 | -0.98% | 4,770 | 2.72 |
| Grove City | 3 | Pennsylvania | 7,747 | 7,875 | -0.41% | 2,874 | 2.70 |
| Homeacre-Lyndora | 4 | Pennsylvania | 7,029 | 6,471 | 2.03% | 1,058 | 6.64 |
| Shanor-Northvue | 5 | Pennsylvania | 5,121 | 5,079 | -0.25% | 758 | 6.75 |
| Meridian | 6 | Pennsylvania | 3,907 | 4,023 | -0.74% | 1,389 | 2.81 |
| Zelienople | 7 | Pennsylvania | 3,753 | 3,905 | -1% | 1,828 | 2.05 |
| Slippery Rock | 8 | Pennsylvania | 3,716 | 3,168 | 3.83% | 2,259 | 1.65 |
| Gibsonia | 9 | Pennsylvania | 3,380 | 2,372 | 8.06% | 879 | 3.85 |
| Meadowood | 10 | Pennsylvania | 2,963 | 2,909 | 0.47% | 1,892 | 1.57 |
| Slippery Rock University | 11 | Pennsylvania | 2,861 | 2,503 | 3.25% | 5,192 | 0.55 |
| Seven Fields | 12 | Pennsylvania | 2,842 | 2,921 | -0.7% | 3,530 | 0.81 |
| Bakerstown | 13 | Pennsylvania | 2,702 | 3,016 | -2.81% | 1,113 | 2.43 |
| Oak Hills | 14 | Pennsylvania | 2,622 | 2,238 | 3.8% | 778 | 3.37 |
| Freeport | 15 | Pennsylvania | 1,677 | 1,739 | -0.95% | 1,320 | 1.27 |
| Evans City | 16 | Pennsylvania | 1,672 | 1,740 | -1.01% | 2,044 | 0.82 |
| Nixon | 17 | Pennsylvania | 1,654 | 1,312 | 5.49% | 615 | 2.69 |
| Mars | 18 | Pennsylvania | 1,412 | 1,462 | -0.91% | 3,004 | 0.47 |
| Saxonburg | 19 | Pennsylvania | 1,372 | 1,428 | -1.01% | 1,514 | 0.91 |
| Prospect | 20 | Pennsylvania | 1,081 | 1,120 | -0.92% | 265 | 4.08 |
| Harmony | 21 | Pennsylvania | 918 | 950 | -0.86% | 2,330 | 0.39 |
| Chicora | 22 | Pennsylvania | 884 | 918 | -1.01% | 1,659 | 0.53 |
| Unionville | 23 | Pennsylvania | 828 | 608 | 7.12% | 322 | 2.57 |
| Harrisville | 24 | Pennsylvania | 793 | 820 | -0.88% | 986 | 0.80 |
| Connoquenessing | 25 | Pennsylvania | 782 | 673 | 3.58% | 577 | 1.35 |
| Valencia | 26 | Pennsylvania | 740 | 539 | 7.25% | 2,176 | 0.34 |
| East Butler | 27 | Pennsylvania | 736 | 764 | -0.94% | 706 | 1.04 |
| Bairdford | 28 | Pennsylvania | 679 | 524 | 1.95% | 433 | 1.57 |
| Parker | 29 | Pennsylvania | 676 | 698 | -0.88% | 707 | 0.96 |
| Emlenton | 30 | Pennsylvania | 598 | 618 | -0.83% | 1,027 | 0.58 |
| Lake Arthur Estates | 31 | Pennsylvania | 492 | 466 | 1.44% | 742 | 0.66 |
| Clintonville | 32 | Pennsylvania | 428 | 440 | -0.7% | 392 | 1.09 |
| Bruin | 33 | Pennsylvania | 403 | 422 | -1.23% | 221 | 1.82 |
| Callery | 34 | Pennsylvania | 345 | 359 | -1.15% | 642 | 0.54 |
| West Liberty | 35 | Pennsylvania | 319 | 333 | -1.24% | 83 | 3.84 |
| Eau Claire | 36 | Pennsylvania | 296 | 308 | -1% | 232 | 1.27 |
| Portersville | 37 | Pennsylvania | 221 | 231 | -1.34% | 278 | 0.80 |
| Fairview | 38 | Pennsylvania | 185 | 179 | 0.54% | 1,637 | 0.11 |
| Barkeyville | 39 | Pennsylvania | 183 | 190 | -1.08% | 55 | 3.32 |
| West Sunbury | 40 | Pennsylvania | 175 | 182 | -1.13% | 1,591 | 0.11 |
| Petrolia | 41 | Pennsylvania | 171 | 178 | -1.16% | 433 | 0.40 |
| Karns City | 42 | Pennsylvania | 165 | 172 | -1.2% | 455 | 0.36 |
| Callensburg | 43 | Pennsylvania | 143 | 147 | -0.69% | 986 | 0.14 |
| Cherry Valley | 44 | Pennsylvania | 56 | 59 | -1.75% | 20 | 2.82 |
Note: City markers shown outside the county boundary mean that a part of the city extends into this county, but is primarily located in an adjacent county.
Allison Park is the largest city in Butler County.
Cherry Valley is the smallest city in Butler County.
There are 44 cities in Butler County, Pennsylvania.