53 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Robinson | 1 | 15,760 | 15,506 | 0.61% | 1,036 | 15 | Township |
| Indiana | 2 | 14,362 | 14,021 | 0.48% | 8,165 | 2 | Borough |
| Indiana | 3 | 7,438 | 7,245 | 0.92% | 423 | 18 | Township |
| Center | 4 | 4,373 | 4,384 | 0.02% | 109 | 40 | Township |
| Armagh | 5 | 4,060 | 4,018 | 0.17% | 44 | 93 | Township |
| Burrell | 6 | 3,466 | 3,480 | 0% | 145 | 24 | Township |
| Green | 7 | 3,407 | 3,412 | 0.09% | 65 | 53 | Township |
| Blairsville | 8 | 3,210 | 3,215 | -0.03% | 2,270 | 1 | Borough |
| Rayne | 9 | 2,775 | 2,783 | 0.11% | 59 | 47 | Township |
| Armstrong | 10 | 2,763 | 2,756 | 0.11% | 73 | 38 | Township |
| Cherryhill | 11 | 2,427 | 2,444 | -0.08% | 50 | 49 | Township |
| East Wheatfield | 12 | 2,127 | 2,134 | 0% | 78 | 27 | Township |
| West Wheatfield | 13 | 2,119 | 2,140 | -0.19% | 67 | 32 | Township |
| Conemaugh | 14 | 2,054 | 2,060 | 0% | 61 | 34 | Township |
| Pine | 15 | 1,855 | 1,856 | 0.05% | 60 | 31 | Township |
| South Mahoning | 16 | 1,817 | 1,818 | 0% | 64 | 29 | Township |
| Homer City | 17 | 1,724 | 1,729 | -0.06% | 3,123 | 1 | Borough |
| Young | 18 | 1,683 | 1,687 | 0% | 48 | 35 | Township |
| Brush Valley | 19 | 1,682 | 1,673 | 0.24% | 41 | 41 | Township |
| Robinson | 20 | 1,678 | 1,708 | -0.24% | 79 | 21 | Township |
| Canoe | 21 | 1,422 | 1,426 | -0.14% | 53 | 27 | Township |
| North Mahoning | 22 | 1,329 | 1,332 | 0.08% | 47 | 28 | Township |
| Clymer | 23 | 1,316 | 1,320 | -0.08% | 2,313 | 1 | Borough |
| West Mahoning | 24 | 1,311 | 1,322 | -0.3% | 45 | 29 | Township |
| Chevy Chase Heights | 25 | 1,276 | 1,463 | -1.16% | 1,006 | 1 | CDP |
| Buffington | 26 | 1,227 | 1,227 | 0.16% | 40 | 31 | Township |
| Black Lick | 27 | 1,117 | 1,119 | 0% | 40 | 28 | Township |
| East Mahoning | 28 | 964 | 962 | 0% | 31 | 31 | Township |
| Dixonville | 29 | 930 | 948 | 7.14% | 1,031 | 1 | CDP |
| Banks | 30 | 899 | 901 | 0% | 28 | 32 | Township |
| Black Lick | 31 | 883 | 1,416 | -4.23% | 354 | 2 | CDP |
| Lucerne Mines | 32 | 867 | 935 | -0.57% | 1,033 | 1 | CDP |
| West Lebanon | 33 | 851 | 833 | 0.71% | 2,199 | 0 | Township |
| Saltsburg | 34 | 767 | 770 | -0.13% | 3,705 | 0 | Borough |
| Rossiter | 35 | 665 | 752 | 0.15% | 353 | 2 | CDP |
| Grant | 36 | 634 | 635 | 0% | 24 | 27 | Township |
| Clymer | 37 | 608 | 620 | -0.16% | 18 | 34 | Township |
| Robinson | 38 | 467 | 409 | -1.89% | 603 | 1 | CDP |
| Jacksonville | 39 | 462 | 482 | -2.53% | 94 | 5 | CDP |
| Ernest | 40 | 420 | 419 | 0% | 1,826 | 0 | Borough |
| Marion Center | 41 | 405 | 404 | 0% | 545 | 1 | Borough |
| Creekside | 42 | 285 | 285 | 0% | 1,290 | 0 | Borough |
| Cherry Tree | 43 | 272 | 272 | 0% | 542 | 1 | Borough |
| Glen Campbell | 44 | 252 | 254 | -0.4% | 271 | 1 | Borough |
| Plumville | 45 | 251 | 254 | -0.4% | 506 | 0 | Borough |
| Coral | 46 | 211 | 334 | -3.65% | 1,192 | 0 | CDP |
| Alverda | 47 | 209 | 141 | 7.18% | 255 | 1 | CDP |
| Commodore | 48 | 158 | 327 | -7.06% | 190 | 1 | CDP |
| Graceton | 49 | 123 | 160 | -6.82% | 1,017 | 0 | CDP |
| Heilwood | 50 | 115 | 196 | -25.32% | 92 | 1 | CDP |
| Armagh | 51 | 100 | 102 | -0.99% | 1,754 | 0 | Borough |
| Shelocta | 52 | 98 | 100 | -1.01% | 942 | 0 | Borough |
| Smicksburg | 53 | 56 | 56 | 0% | 384 | 0 | Borough |
Robinson is the largest city in Indiana County, with a population of 15,760.
Smicksburg is the smallest city in Indiana County, with a population of 56.
There are 53 cities in Indiana County, Pennsylvania.