| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Pittsburgh | 1 | 308,597 | 302,859 | 0.31% | 5,573 | 55 | City |
| Ross | 2 | 32,091 | 33,544 | -0.39% | 2,217 | 14 | Township |
| Bethel Park | 3 | 31,757 | 33,545 | -0.99% | 2,714 | 12 | Township |
| McCandless | 4 | 28,285 | 29,666 | -0.54% | 1,715 | 16 | Township |
| Monroeville | 5 | 27,487 | 28,645 | -0.72% | 1,394 | 20 | Township |
| Moon | 6 | 26,838 | 27,215 | 0.31% | 1,124 | 24 | Township |
| Shaler | 7 | 26,661 | 28,087 | -0.64% | 2,409 | 11 | Township |
| Plum | 8 | 26,022 | 27,128 | -0.77% | 911 | 29 | Borough |
| Upper St. Clair | 9 | 20,378 | 21,149 | -0.43% | 2,076 | 10 | Township |
| Baldwin | 10 | 20,300 | 21,490 | -1.05% | 3,518 | 6 | Borough |
| South Fayette | 11 | 18,766 | 18,349 | 0.63% | 924 | 20 | Township |
| West Mifflin | 12 | 18,522 | 19,568 | -0.99% | 1,303 | 14 | Borough |
| Hampton | 13 | 17,730 | 18,462 | -0.44% | 1,094 | 16 | Township |
| McKeesport | 14 | 16,736 | 17,700 | -1.01% | 3,315 | 5 | City |
| Scott | 15 | 16,733 | 17,610 | -0.62% | 4,297 | 4 | Township |
| North Fayette | 16 | 16,006 | 16,200 | -0.07% | 635 | 25 | Township |
| Pine | 17 | 15,459 | 14,753 | -0.1% | 911 | 17 | Township |
| Franklin Park | 18 | 14,862 | 15,492 | -0.77% | 1,098 | 14 | Borough |
| South Park | 19 | 13,597 | 13,688 | -0.12% | 1,456 | 9 | Township |
| Wilkinsburg | 20 | 13,456 | 14,277 | -1.07% | 5,972 | 2 | Borough |
| West Deer | 21 | 12,413 | 12,259 | 0.91% | 429 | 29 | Township |
| Elizabeth | 22 | 12,329 | 12,961 | -0.56% | 541 | 23 | Township |
| Jefferson Hills | 23 | 12,312 | 12,429 | -0.36% | 742 | 17 | Borough |
| Lower Burrell | 24 | 11,415 | 11,753 | -0.48% | 1,013 | 11 | City |
| Marshall | 25 | 10,641 | 10,155 | 1.35% | 689 | 15 | Township |
| Munhall | 26 | 10,143 | 10,761 | -1.07% | 4,423 | 2 | Borough |
| Harrison | 27 | 9,623 | 10,163 | -0.67% | 1,303 | 7 | Township |
| North Versailles | 28 | 9,525 | 10,058 | -0.65% | 1,190 | 8 | Township |
| Brentwood | 29 | 9,493 | 10,077 | -1.08% | 6,551 | 1 | Borough |
| Collier | 30 | 9,202 | 8,947 | 1.09% | 676 | 14 | Township |
| Economy | 31 | 9,077 | 9,056 | -0.23% | 508 | 18 | Borough |
| O'Hara | 32 | 8,881 | 9,263 | -0.31% | 1,266 | 7 | Township |
| Kennedy | 33 | 8,432 | 8,695 | 0.15% | 1,538 | 5 | Township |
| Pleasant Hills | 34 | 8,160 | 8,473 | -0.63% | 2,939 | 3 | Borough |
| Swissvale | 35 | 8,107 | 8,611 | -1.1% | 6,722 | 1 | Borough |
| Castle Shannon | 36 | 7,949 | 8,284 | -0.71% | 4,974 | 2 | Borough |
| Bellevue | 37 | 7,802 | 8,283 | -1.09% | 7,725 | 1 | Borough |
| Dormont | 38 | 7,730 | 8,215 | -1.1% | 10,171 | 1 | Borough |
| Carnegie | 39 | 7,702 | 8,127 | -0.96% | 4,751 | 2 | Borough |
| Findlay | 40 | 7,640 | 6,410 | 1.31% | 237 | 32 | Township |
| Ohio | 41 | 7,232 | 7,168 | -0.5% | 1,055 | 7 | Township |
| White Oak | 42 | 7,211 | 7,631 | -1.03% | 1,089 | 7 | Borough |
| Oakmont | 43 | 6,535 | 6,765 | -0.62% | 4,126 | 2 | Borough |
| West View | 44 | 6,286 | 6,672 | -1.09% | 6,224 | 1 | Borough |
| Stowe | 45 | 6,076 | 6,423 | -0.7% | 3,066 | 2 | Township |
| Forest Hills | 46 | 6,050 | 6,421 | -1.08% | 3,866 | 2 | Borough |
| Wilkins | 47 | 6,004 | 6,336 | -0.66% | 2,190 | 3 | Township |
| Clairton | 48 | 5,812 | 6,171 | -1.09% | 2,099 | 3 | City |
| Crafton | 49 | 5,726 | 6,083 | -1.11% | 5,014 | 1 | Borough |
| McKees Rocks | 50 | 5,563 | 5,904 | -1.08% | 5,268 | 1 | Borough |
| Sewickley | 51 | 5,511 | 5,652 | -0.43% | 206 | 27 | Township |
| Coraopolis | 52 | 5,223 | 5,545 | -1.08% | 3,927 | 1 | Borough |
| Fox Chapel | 53 | 5,095 | 5,337 | -0.86% | 648 | 8 | Borough |
| Duquesne | 54 | 4,969 | 5,247 | -1% | 2,736 | 2 | City |
| Turtle Creek | 55 | 4,812 | 5,108 | -1.09% | 4,946 | 1 | Borough |
| Green Tree | 56 | 4,623 | 4,899 | -1.05% | 2,228 | 2 | Borough |
| Arnold | 57 | 4,588 | 4,768 | -0.67% | 6,268 | 1 | City |
| Avalon | 58 | 4,523 | 4,795 | -1.07% | 7,331 | 1 | Borough |
| Bridgeville | 59 | 4,520 | 4,792 | -1.07% | 4,128 | 1 | Borough |
| Glassport | 60 | 4,205 | 4,463 | -1.08% | 2,658 | 2 | Borough |
| Tarentum | 61 | 4,081 | 4,336 | -1.11% | 3,318 | 1 | Borough |
| North Braddock | 62 | 4,062 | 4,312 | -1.1% | 2,723 | 1 | Borough |
| Elizabeth | 63 | 3,947 | 3,979 | -0.1% | 227 | 17 | Township |
| Sewickley | 64 | 3,691 | 3,902 | -1.02% | 3,695 | 1 | Borough |
| Port Vue | 65 | 3,488 | 3,667 | -0.88% | 3,076 | 1 | Borough |
| Etna | 66 | 3,233 | 3,429 | -1.1% | 4,393 | 1 | Borough |
| Springdale | 67 | 3,199 | 3,395 | -1.08% | 3,425 | 1 | Borough |
| Ingram | 68 | 3,186 | 3,387 | -1.12% | 7,341 | 0 | Borough |
| Mount Oliver | 69 | 3,186 | 3,386 | -1.12% | 9,398 | 0 | Borough |
| Millvale | 70 | 3,178 | 3,364 | -1.03% | 5,134 | 1 | Borough |
| Reserve | 71 | 3,104 | 3,255 | -0.58% | 1,504 | 2 | Township |
| Brackenridge | 72 | 3,061 | 3,241 | -1.03% | 5,967 | 1 | Borough |
| Churchill | 73 | 2,981 | 3,165 | -1.09% | 1,362 | 2 | Borough |
| Harmar | 74 | 2,980 | 3,133 | -0.6% | 508 | 6 | Township |
| Edgewood | 75 | 2,967 | 3,129 | -1% | 5,046 | 1 | Borough |
| Sharpsburg | 76 | 2,957 | 3,141 | -1.1% | 6,122 | 0 | Borough |
| Pitcairn | 77 | 2,921 | 3,101 | -1.08% | 5,773 | 1 | Borough |
| Forward | 78 | 2,899 | 3,063 | -0.65% | 153 | 19 | Township |
| Seven Fields | 79 | 2,848 | 2,927 | -0.56% | 3,538 | 1 | Borough |
| Homestead | 80 | 2,811 | 2,882 | -0.39% | 4,880 | 1 | Borough |
| Aspinwall | 81 | 2,778 | 2,951 | -1.1% | 7,915 | 0 | Borough |
| Verona | 82 | 2,370 | 2,516 | -1.09% | 4,675 | 1 | Borough |
| Crescent | 83 | 2,352 | 2,479 | -0.72% | 1,124 | 2 | Township |
| Emsworth | 84 | 2,351 | 2,496 | -1.09% | 4,132 | 1 | Borough |
| Morgan | 85 | 2,162 | 2,328 | -1.14% | 88 | 25 | Township |
| Fawn | 86 | 2,082 | 2,177 | -0.53% | 162 | 13 | Township |
| McDonald | 87 | 1,981 | 2,051 | -0.65% | 3,824 | 1 | Borough |
| Rankin | 88 | 1,978 | 1,890 | 0.15% | 4,568 | 0 | Borough |
| East McKeesport | 89 | 1,947 | 2,069 | -1.12% | 4,714 | 0 | Borough |
| Baldwin | 90 | 1,883 | 1,981 | -0.69% | 3,729 | 1 | Township |
| East Pittsburgh | 91 | 1,815 | 1,925 | -1.09% | 4,678 | 0 | Borough |
| Ben Avon | 92 | 1,804 | 1,917 | -1.1% | 4,760 | 0 | Borough |
| West Homestead | 93 | 1,759 | 1,863 | -1.07% | 1,908 | 1 | Borough |
| Wilmerding | 94 | 1,682 | 1,781 | -1.06% | 3,921 | 0 | Borough |
| Braddock Hills | 95 | 1,632 | 1,730 | -1.09% | 1,722 | 1 | Borough |
| Braddock | 96 | 1,631 | 1,719 | -0.97% | 2,897 | 1 | Borough |
| Edgeworth | 97 | 1,597 | 1,674 | -0.87% | 1,068 | 1 | Borough |
| Cheswick | 98 | 1,577 | 1,670 | -1.07% | 3,406 | 0 | Borough |
| Leet | 99 | 1,542 | 1,623 | -0.58% | 1,027 | 2 | Township |
| Dravosburg | 100 | 1,519 | 1,610 | -1.11% | 1,572 | 1 | Borough |
| Springdale | 101 | 1,455 | 1,534 | -0.55% | 646 | 2 | Township |
| Bell Acres | 102 | 1,443 | 1,505 | -0.76% | 270 | 5 | Borough |
| East Deer | 103 | 1,409 | 1,485 | -0.56% | 620 | 2 | Township |
| Oakdale | 104 | 1,398 | 1,478 | -1.06% | 2,981 | 0 | Borough |
| Versailles | 105 | 1,390 | 1,478 | -1.14% | 2,872 | 0 | Borough |
| Blawnox | 106 | 1,369 | 1,454 | -1.08% | 4,625 | 0 | Borough |
| Elizabeth | 107 | 1,332 | 1,397 | -0.82% | 3,883 | 0 | Borough |
| Frazer | 108 | 1,220 | 1,174 | -0.57% | 131 | 9 | Township |
| Heidelberg | 109 | 1,216 | 1,292 | -1.14% | 4,237 | 0 | Borough |
| Bradford Woods | 110 | 1,114 | 1,180 | -1.07% | 1,250 | 1 | Borough |
| Whitaker | 111 | 1,110 | 1,180 | -1.16% | 3,750 | 0 | Borough |
| Leetsdale | 112 | 1,091 | 1,154 | -1% | 1,092 | 1 | Borough |
| Neville | 113 | 1,044 | 1,105 | -0.76% | 682 | 2 | Township |
| Lincoln | 114 | 878 | 929 | -1.13% | 183 | 5 | Borough |
| Sewickley Heights | 115 | 820 | 858 | -0.85% | 112 | 7 | Borough |
| North Irwin | 116 | 800 | 821 | -0.5% | 3,960 | 0 | Borough |
| Kilbuck | 117 | 737 | 779 | -0.67% | 291 | 3 | Township |
| Chalfant | 118 | 702 | 746 | -1.13% | 4,443 | 0 | Borough |
| Sewickley Hills | 119 | 679 | 692 | -0.29% | 275 | 2 | Borough |
| Pennsbury Village | 120 | 637 | 675 | -1.09% | 8,493 | 0 | Borough |
| Glen Osborne | 121 | 551 | 586 | -1.25% | 1,281 | 0 | Borough |
| Wall | 122 | 487 | 517 | -1.22% | 1,114 | 0 | Borough |
| Thornburg | 123 | 442 | 470 | -1.12% | 1,009 | 0 | Borough |
| Rosslyn Farms | 124 | 414 | 440 | -1.19% | 746 | 1 | Borough |
| West Elizabeth | 125 | 381 | 402 | -1.04% | 2,128 | 0 | Borough |
| Ben Avon Heights | 126 | 371 | 396 | -1.33% | 2,132 | 0 | Borough |
| South Versailles | 127 | 302 | 317 | -0.33% | 348 | 1 | Township |
| Glenfield | 128 | 198 | 210 | -1% | 241 | 1 | Borough |
| Haysville | 129 | 76 | 81 | -1.3% | 439 | 0 | Borough |
Pittsburgh is the largest city in Allegheny County, with a population of 308,597.
Haysville is the smallest city in Allegheny County, with a population of 76.
There are 129 cities in Allegheny County, Pennsylvania.