82 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Hempfield township | 1 | 41,203 | 41,518 | -0.5% | 537 | 76.74 | Township |
| North Huntingdon township | 2 | 31,786 | 31,869 | 0% | 1,164 | 27.30 | Township |
| Derry township | 3 | 24,832 | 24,729 | -0.22% | 915 | 27.13 | Township |
| Manor township | 4 | 22,009 | 21,842 | -0.01% | 574 | 38.33 | Township |
| Unity township | 5 | 21,173 | 21,591 | -0.33% | 314 | 67.44 | Township |
| Penn township | 6 | 20,767 | 20,117 | 0.44% | 675 | 30.77 | Township |
| Murrysville | 7 | 20,601 | 20,961 | -0.35% | 559 | 36.83 | Township |
| Penn township | 8 | 18,591 | 17,514 | 1.1% | 1,433 | 12.98 | Township |
| Greensburg | 9 | 14,403 | 14,903 | -0.69% | 3,559 | 4.05 | City |
| Derry township | 10 | 13,314 | 13,601 | -0.4% | 139 | 95.57 | Township |
| New Kensington | 11 | 11,751 | 12,150 | -0.68% | 2,976 | 3.95 | City |
| Rostraver township | 12 | 11,430 | 11,382 | 0.04% | 356 | 32.12 | Township |
| Penn township | 13 | 11,389 | 10,220 | 3.51% | 385 | 29.58 | Township |
| Mount Pleasant township | 14 | 9,911 | 10,115 | -0.37% | 179 | 55.36 | Township |
| Jeannette | 15 | 8,475 | 8,765 | -0.68% | 3,549 | 2.39 | City |
| Allegheny township | 16 | 8,135 | 8,309 | -0.4% | 262 | 31.06 | Township |
| Latrobe | 17 | 7,831 | 8,058 | -0.57% | 3,381 | 2.32 | Borough |
| East Huntingdon township | 18 | 7,539 | 7,693 | -0.24% | 229 | 32.95 | Township |
| Derry township | 19 | 7,189 | 7,217 | -0.29% | 234 | 30.73 | Township |
| Monessen | 20 | 6,631 | 6,861 | -0.69% | 2,297 | 2.89 | City |
| Salem township | 21 | 5,935 | 6,093 | -0.45% | 126 | 47.09 | Township |
| Ligonier township | 22 | 5,928 | 6,059 | -0.39% | 64 | 92.42 | Township |
| Penn township | 23 | 5,679 | 5,637 | 0.03% | 592 | 9.60 | Township |
| South Huntingdon township | 24 | 5,275 | 5,416 | -0.47% | 116 | 45.42 | Township |
| Vandergrift | 25 | 4,890 | 5,060 | -0.69% | 3,593 | 1.36 | Borough |
| Penn township | 26 | 4,876 | 4,991 | -0.27% | 201 | 24.28 | Township |
| Mount Pleasant township | 27 | 4,794 | 4,665 | 0.67% | 158 | 30.39 | Township |
| Scottdale | 28 | 4,281 | 4,421 | -0.65% | 3,675 | 1.17 | Borough |
| Penn township | 29 | 4,172 | 4,045 | 0.92% | 237 | 17.61 | Township |
| Mount Pleasant | 30 | 4,105 | 4,244 | -0.68% | 4,101 | 1 | Borough |
| Manor township | 31 | 3,985 | 4,179 | -1.14% | 240 | 16.57 | Township |
| Irwin | 32 | 3,765 | 3,884 | -0.63% | 4,498 | 0.84 | Borough |
| Manor | 33 | 3,484 | 3,574 | -0.51% | 1,821 | 1.91 | Borough |
| Mount Pleasant township | 34 | 3,371 | 3,293 | 0.54% | 95 | 35.63 | Township |
| Trafford | 35 | 3,197 | 3,312 | -0.71% | 2,211 | 1.45 | Borough |
| Penn township | 36 | 3,162 | 3,101 | 0.54% | 149 | 21.19 | Township |
| Penn township | 37 | 2,891 | 2,880 | -0.21% | 98 | 29.57 | Township |
| Youngwood | 38 | 2,870 | 2,969 | -0.69% | 1,496 | 1.92 | Borough |
| Delmont | 39 | 2,604 | 2,611 | -0.04% | 2,466 | 1.06 | Borough |
| West Newton | 40 | 2,567 | 2,661 | -0.73% | 2,475 | 1.04 | Borough |
| Derry | 41 | 2,552 | 2,637 | -0.66% | 3,306 | 0.77 | Borough |
| Madison township | 42 | 2,507 | 2,464 | 0.44% | 148 | 16.95 | Township |
| Penn township | 43 | 2,438 | 2,119 | 4.14% | 132 | 18.50 | Township |
| Donegal township | 44 | 2,372 | 2,396 | -0.08% | 57 | 41.48 | Township |
| New Stanton | 45 | 2,255 | 2,330 | -0.66% | 563 | 4.01 | Borough |
| Donegal township | 46 | 2,206 | 2,196 | 0.41% | 45 | 49.10 | Township |
| Southwest Greensburg | 47 | 2,142 | 2,219 | -0.69% | 5,464 | 0.39 | Borough |
| Upper Burrell township | 48 | 2,112 | 2,169 | -0.42% | 140 | 15.13 | Township |
| South Greensburg | 49 | 2,094 | 2,131 | -0.33% | 2,962 | 0.71 | Borough |
| Bell township | 50 | 2,081 | 2,079 | 0.19% | 97 | 21.49 | Township |
| Loyalhanna township | 51 | 2,039 | 2,083 | -0.34% | 95 | 21.57 | Township |
| Cook township | 52 | 1,841 | 1,889 | -0.43% | 39 | 46.76 | Township |
| Donegal township | 53 | 1,764 | 1,820 | -0.28% | 76 | 23.19 | Township |
| Madison township | 54 | 1,571 | 1,562 | 0.32% | 45 | 35.16 | Township |
| Apollo | 55 | 1,541 | 1,608 | -0.84% | 5,052 | 0.30 | Borough |
| Mount Pleasant township | 56 | 1,506 | 1,501 | -0.07% | 90 | 16.68 | Township |
| Ligonier | 57 | 1,461 | 1,510 | -0.68% | 2,899 | 0.50 | Borough |
| Mount Pleasant township | 58 | 1,451 | 1,439 | -0.07% | 26 | 56.46 | Township |
| Irwin township | 59 | 1,212 | 1,250 | -0.57% | 40 | 30.30 | Township |
| Penn township | 60 | 1,174 | 1,197 | -0.84% | 42 | 28.21 | Township |
| Penn township | 61 | 1,151 | 1,199 | -0.95% | 48 | 24.12 | Township |
| Madison township | 62 | 1,129 | 1,157 | -0.35% | 42 | 26.68 | Township |
| Penn township | 63 | 1,068 | 1,076 | 0.19% | 37 | 28.62 | Township |
| Derry township | 64 | 1,038 | 1,093 | -1.43% | 64 | 16.15 | Township |
| Avonmore | 65 | 873 | 902 | -0.68% | 593 | 1.47 | Borough |
| Export | 66 | 864 | 896 | -0.69% | 2,144 | 0.40 | Borough |
| Penn | 67 | 742 | 436 | 8.96% | 4,726 | 0.16 | Borough |
| New Florence | 68 | 647 | 672 | -0.77% | 1,973 | 0.33 | Borough |
| East Vandergrift | 69 | 583 | 602 | -0.68% | 4,627 | 0.13 | Borough |
| Sutersville | 70 | 548 | 552 | -0.18% | 2,015 | 0.27 | Borough |
| Hyde Park | 71 | 491 | 506 | -0.61% | 2,046 | 0.24 | Borough |
| New Alexandria | 72 | 481 | 500 | -0.83% | 568 | 0.85 | Borough |
| Bolivar | 73 | 420 | 434 | -0.71% | 2,456 | 0.17 | Borough |
| Seward | 74 | 397 | 409 | -0.5% | 1,965 | 0.20 | Borough |
| Madison | 75 | 353 | 363 | -0.56% | 810 | 0.44 | Borough |
| Smithton | 76 | 331 | 345 | -0.9% | 3,245 | 0.10 | Borough |
| Hunker | 77 | 297 | 311 | -1% | 1,174 | 0.25 | Borough |
| Arona | 78 | 244 | 253 | -0.81% | 467 | 0.52 | Borough |
| Youngstown | 79 | 244 | 253 | -0.81% | 2,198 | 0.11 | Borough |
| Laurel Mountain | 80 | 141 | 146 | -0.7% | 1,093 | 0.13 | Borough |
| Adamsburg | 81 | 140 | 145 | -0.71% | 500 | 0.28 | Borough |
| Donegal | 82 | 98 | 102 | -1.01% | 432 | 0.23 | Borough |
Hempfield township is the largest city in Westmoreland County, with a population of 41,203.
Donegal is the smallest city in Westmoreland County.
There are 82 cities in Westmoreland County, Pennsylvania.