| City | Rank | 2026 Pop. ↓ | 2020 Pop. | Annual Change | Density (/mi²) | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lock Haven | 1 | 8,601 | 8,094 | 1.19% | 3,446 | 2 | City |
| Pine Creek | 2 | 3,431 | 3,420 | 0.18% | 238 | 14 | Township |
| Lamar | 3 | 2,674 | 2,617 | 0.79% | 65 | 41 | Township |
| Bald Eagle | 4 | 2,049 | 2,053 | 0.1% | 49 | 42 | Township |
| Greene | 5 | 1,830 | 1,764 | 0.99% | 39 | 47 | Township |
| Porter | 6 | 1,510 | 1,489 | 0.47% | 59 | 26 | Township |
| Avis | 7 | 1,459 | 1,469 | -0.14% | 2,947 | 0 | Borough |
| Mill Hall | 8 | 1,453 | 1,469 | -0.21% | 1,578 | 1 | Borough |
| Flemington | 9 | 1,254 | 1,263 | -0.16% | 2,750 | 0 | Borough |
| Castanea | 10 | 1,093 | 1,100 | 0% | 199 | 6 | Township |
| Renovo | 11 | 1,041 | 1,055 | -0.29% | 990 | 1 | Borough |
| Dunnstable | 12 | 994 | 982 | 0.4% | 106 | 9 | Township |
| Crawford | 13 | 984 | 973 | 0.2% | 44 | 22 | Township |
| Beech Creek | 14 | 961 | 970 | -0.21% | 10 | 96 | Township |
| Chapman | 15 | 898 | 890 | 0.34% | 9.0 | 100 | Township |
| Logan | 16 | 876 | 873 | -0.11% | 36 | 24 | Township |
| Beech Creek | 17 | 730 | 738 | -0.27% | 1,347 | 1 | Borough |
| Loganton | 18 | 466 | 466 | 0% | 443 | 1 | Borough |
| South Renovo | 19 | 402 | 406 | -0.25% | 1,971 | 0 | Borough |
| Gallagher | 20 | 392 | 389 | 0% | 7.0 | 54 | Township |
| Noyes | 21 | 337 | 334 | 0% | 4.0 | 89 | Township |
| Salladasburg | 22 | 242 | 248 | -0.41% | 311 | 1 | Borough |
| Colebrook | 23 | 197 | 197 | 0% | 11 | 18 | Township |
| Leidy | 24 | 153 | 154 | 0% | 2.0 | 97 | Township |
| Grugan | 25 | 46 | 46 | 0% | 1.0 | 68 | Township |
| West Keating | 26 | 18 | 18 | 0% | 0 | 38 | Township |
| East Keating | 27 | 10 | 10 | 0% | 0 | 51 | Township |
Lock Haven is the largest city in Clinton County, with a population of 8,601.
East Keating is the smallest city in Clinton County, with a population of 10.
There are 27 cities in Clinton County, Pennsylvania.