| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Center | 1 | 12,113 | 11,754 | 0.96% | 795 | 15 | Township |
| Aliquippa | 2 | 8,947 | 9,240 | -0.61% | 2,133 | 4 | City |
| Brighton | 3 | 8,809 | 8,771 | 0.2% | 454 | 19 | Township |
| Beaver Falls | 4 | 8,798 | 8,988 | -0.38% | 4,121 | 2 | City |
| Chippewa | 5 | 8,145 | 8,024 | 0.47% | 519 | 16 | Township |
| New Sewickley | 6 | 7,031 | 7,153 | -0.1% | 215 | 33 | Township |
| Ambridge | 7 | 6,925 | 6,979 | -0.27% | 4,657 | 1 | Borough |
| New Brighton | 8 | 5,470 | 5,643 | -0.6% | 5,300 | 1 | Borough |
| North Sewickley | 9 | 5,463 | 5,468 | 0.4% | 263 | 21 | Township |
| Monaca | 10 | 5,421 | 5,607 | -0.64% | 2,674 | 2 | Borough |
| Beaver | 11 | 4,320 | 4,425 | -0.51% | 4,716 | 1 | Borough |
| Baden | 12 | 3,809 | 3,925 | -0.57% | 1,685 | 2 | Borough |
| Clinton | 13 | 3,608 | 3,700 | 0% | 132 | 27 | Township |
| Rochester | 14 | 3,336 | 3,452 | -0.66% | 5,673 | 1 | Borough |
| Ohioville | 15 | 3,309 | 3,346 | -0.24% | 142 | 23 | Borough |
| Daugherty | 16 | 3,034 | 3,096 | -0.03% | 307 | 10 | Township |
| Patterson | 17 | 3,033 | 3,109 | -0.16% | 1,834 | 2 | Township |
| Freedom | 18 | 2,928 | 2,994 | -0.17% | 169 | 17 | Township |
| Clinton | 19 | 2,812 | 2,893 | -0.42% | 119 | 24 | Township |
| Raccoon | 20 | 2,740 | 2,777 | 0.11% | 146 | 19 | Township |
| Rochester | 21 | 2,692 | 2,769 | -0.22% | 693 | 4 | Township |
| South Beaver | 22 | 2,660 | 2,684 | 0.15% | 90 | 30 | Township |
| Midland | 23 | 2,342 | 2,428 | -0.68% | 1,295 | 2 | Borough |
| Greene | 24 | 2,261 | 2,186 | -0.13% | 90 | 25 | Township |
| Independence | 25 | 2,240 | 2,262 | 0.18% | 97 | 23 | Township |
| Conway | 26 | 2,111 | 2,165 | -0.52% | 1,654 | 1 | Borough |
| Clinton | 27 | 2,084 | 2,038 | 0.63% | 54 | 38 | Township |
| Big Beaver | 28 | 1,812 | 1,857 | -0.55% | 102 | 18 | Borough |
| Darlington | 29 | 1,781 | 1,808 | 0.23% | 81 | 22 | Township |
| Beaver | 30 | 1,781 | 1,825 | -0.06% | 53 | 33 | Township |
| Industry | 31 | 1,772 | 1,827 | -0.62% | 175 | 10 | Borough |
| Freedom | 32 | 1,433 | 1,481 | -0.62% | 2,373 | 1 | Borough |
| New Beaver | 33 | 1,336 | 1,372 | -0.52% | 92 | 14 | Borough |
| Clinton | 34 | 1,299 | 1,328 | -0.23% | 105 | 12 | Township |
| Vanport | 35 | 1,257 | 1,289 | -0.24% | 1,374 | 1 | Township |
| West Mayfield | 36 | 1,155 | 1,195 | -0.69% | 1,453 | 1 | Borough |
| Ellport | 37 | 1,081 | 1,085 | 0% | 2,520 | 0 | Borough |
| Clinton | 38 | 935 | 951 | -0.21% | 33 | 28 | Township |
| Beaver | 39 | 891 | 874 | 0.11% | 25 | 35 | Township |
| Freedom | 40 | 849 | 826 | 0.24% | 61 | 14 | Township |
| Beaver | 41 | 790 | 795 | -0.13% | 22 | 37 | Township |
| Bridgewater | 42 | 729 | 743 | -0.41% | 1,170 | 1 | Borough |
| Koppel | 43 | 689 | 709 | -0.58% | 1,283 | 1 | Borough |
| Patterson Heights | 44 | 616 | 639 | -0.65% | 2,738 | 0 | Borough |
| East Rochester | 45 | 556 | 576 | -0.71% | 1,519 | 0 | Borough |
| Potter | 46 | 528 | 518 | 0.76% | 84 | 6 | Township |
| Beaver | 47 | 513 | 514 | 0.2% | 28 | 18 | Township |
| Beaver | 48 | 453 | 468 | -0.22% | 21 | 21 | Township |
| South Heights | 49 | 373 | 385 | -0.8% | 1,141 | 0 | Borough |
| New Galilee | 50 | 319 | 328 | -0.62% | 1,152 | 0 | Borough |
| Darlington | 51 | 245 | 249 | -0.41% | 2,988 | 0 | Borough |
| Fallston | 52 | 243 | 251 | -0.82% | 513 | 0 | Borough |
| Georgetown | 53 | 196 | 203 | -1.01% | 1,120 | 0 | Borough |
| Eastvale | 54 | 184 | 191 | -1.08% | 2,044 | 0 | Borough |
| Shippingport | 55 | 154 | 159 | -0.65% | 45 | 3 | Borough |
| Hookstown | 56 | 128 | 132 | -0.78% | 948 | 0 | Borough |
| Frankfort Springs | 57 | 111 | 115 | -0.89% | 427 | 0 | Borough |
| Homewood | 58 | 87 | 90 | -1.14% | 515 | 0 | Borough |
| S.N.P.J. | 59 | 14 | 16 | -6.67% | 19 | 1 | Borough |
Center is the largest city in Beaver County, with a population of 12,113.
S.N.P.J. is the smallest city in Beaver County, with a population of 14.
There are 59 cities in Beaver County, Pennsylvania.