53 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Robinson township | 1 | 15,674 | 15,509 | 0.53% | 1,030 | 15.21 | Township |
| Indiana | 2 | 14,464 | 14,026 | 0.61% | 8,223 | 1.76 | Borough |
| Indiana township | 3 | 7,154 | 7,245 | -0.83% | 407 | 17.56 | Township |
| Center township | 4 | 4,382 | 4,385 | 0.14% | 109 | 40.16 | Township |
| Armagh township | 5 | 4,117 | 4,019 | 0.88% | 44 | 92.83 | Township |
| Burrell township | 6 | 3,449 | 3,477 | -0.12% | 145 | 23.84 | Township |
| Green township | 7 | 3,396 | 3,411 | 0.03% | 65 | 52.52 | Township |
| Blairsville | 8 | 3,195 | 3,215 | -0.13% | 2,260 | 1.41 | Borough |
| Rayne township | 9 | 2,763 | 2,784 | -0.04% | 59 | 47.13 | Township |
| Armstrong township | 10 | 2,758 | 2,760 | 0.11% | 73 | 37.60 | Township |
| Cherryhill township | 11 | 2,433 | 2,443 | 0.08% | 50 | 48.63 | Township |
| East Wheatfield township | 12 | 2,131 | 2,136 | 0.05% | 78 | 27.20 | Township |
| West Wheatfield township | 13 | 2,128 | 2,139 | 0.09% | 67 | 31.60 | Township |
| Conemaugh township | 14 | 2,056 | 2,056 | 0.19% | 61 | 33.73 | Township |
| Pine township | 15 | 1,855 | 1,857 | 0.16% | 60 | 30.97 | Township |
| South Mahoning township | 16 | 1,816 | 1,821 | 0.06% | 64 | 28.55 | Township |
| Homer City | 17 | 1,710 | 1,724 | -0.18% | 3,098 | 0.55 | Borough |
| Young township | 18 | 1,682 | 1,691 | 0% | 48 | 34.78 | Township |
| Brush Valley township | 19 | 1,672 | 1,673 | 0.12% | 41 | 41.26 | Township |
| Robinson township | 20 | 1,672 | 1,706 | -0.36% | 79 | 21.22 | Township |
| Canoe township | 21 | 1,442 | 1,428 | 0.49% | 53 | 27.04 | Township |
| North Mahoning township | 22 | 1,330 | 1,332 | 0.08% | 47 | 28.21 | Township |
| West Mahoning township | 23 | 1,320 | 1,322 | 0.15% | 46 | 28.94 | Township |
| Clymer | 24 | 1,310 | 1,320 | -0.15% | 2,302 | 0.57 | Borough |
| Chevy Chase Heights | 25 | 1,276 | 1,463 | -1.16% | 1,006 | 1.27 | CDP |
| Buffington township | 26 | 1,225 | 1,227 | 0.08% | 40 | 30.55 | Township |
| Black Lick township | 27 | 1,116 | 1,120 | 0% | 40 | 27.65 | Township |
| East Mahoning township | 28 | 969 | 963 | 0.31% | 31 | 31.28 | Township |
| Dixonville | 29 | 930 | 948 | 7.14% | 1,031 | 0.90 | CDP |
| Banks township | 30 | 901 | 901 | 0.11% | 28 | 31.75 | Township |
| Black Lick | 31 | 883 | 1,416 | -4.23% | 354 | 2.50 | CDP |
| Lucerne Mines | 32 | 867 | 935 | -0.57% | 1,033 | 0.84 | CDP |
| West Lebanon township | 33 | 845 | 833 | 0.48% | 2,183 | 0.39 | Township |
| Saltsburg | 34 | 763 | 768 | -0.13% | 3,686 | 0.21 | Borough |
| Rossiter | 35 | 665 | 752 | 0.15% | 353 | 1.89 | CDP |
| Grant township | 36 | 635 | 635 | 0.16% | 24 | 26.95 | Township |
| Clymer township | 37 | 606 | 621 | -0.49% | 18 | 34.12 | Township |
| Robinson | 38 | 467 | 409 | -1.89% | 603 | 0.77 | CDP |
| Jacksonville | 39 | 462 | 482 | -2.53% | 94 | 4.93 | CDP |
| Ernest | 40 | 415 | 415 | 0% | 1,804 | 0.23 | Borough |
| Marion Center | 41 | 407 | 409 | 0% | 548 | 0.74 | Borough |
| Creekside | 42 | 280 | 284 | -0.36% | 1,267 | 0.22 | Borough |
| Cherry Tree | 43 | 267 | 271 | -0.37% | 532 | 0.50 | Borough |
| Glen Campbell | 44 | 248 | 252 | -0.4% | 266 | 0.93 | Borough |
| Plumville | 45 | 247 | 251 | -0.4% | 498 | 0.50 | Borough |
| Coral | 46 | 211 | 334 | -3.65% | 1,192 | 0.18 | CDP |
| Alverda | 47 | 209 | 141 | 7.18% | 255 | 0.82 | CDP |
| Commodore | 48 | 158 | 327 | -7.06% | 190 | 0.83 | CDP |
| Graceton | 49 | 123 | 160 | -6.82% | 1,017 | 0.12 | CDP |
| Heilwood | 50 | 115 | 196 | -25.32% | 92 | 1.25 | CDP |
| Shelocta | 51 | 100 | 102 | 0% | 962 | 0.10 | Borough |
| Armagh | 52 | 99 | 101 | 0% | 1,737 | 0.06 | Borough |
| Smicksburg | 53 | 56 | 56 | 0% | 384 | 0.15 | Borough |
Robinson township is the largest city in Indiana County, with a population of 15,674.
Smicksburg is the smallest city in Indiana County.
There are 53 cities in Indiana County, Pennsylvania.