27 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lock Haven | 1 | 8,640 | 8,094 | 1.28% | 3,462 | 2 | City |
| Pine Creek | 2 | 3,405 | 3,407 | 0% | 236 | 14 | Township |
| Lamar | 3 | 2,650 | 2,615 | 0.72% | 65 | 41 | Township |
| Bald Eagle | 4 | 2,020 | 2,039 | -0.2% | 49 | 42 | Township |
| Greene | 5 | 1,804 | 1,765 | 0.33% | 39 | 47 | Township |
| Porter | 6 | 1,495 | 1,487 | -0.07% | 58 | 26 | Township |
| Avis | 7 | 1,466 | 1,471 | -0.07% | 2,962 | 0 | Borough |
| Mill Hall | 8 | 1,465 | 1,473 | -0.14% | 1,591 | 1 | Borough |
| Flemington | 9 | 1,267 | 1,269 | -0.08% | 2,779 | 0 | Borough |
| Castanea | 10 | 1,097 | 1,102 | -0.09% | 199 | 6 | Township |
| Renovo | 11 | 1,049 | 1,058 | -0.19% | 998 | 1 | Borough |
| Dunnstable | 12 | 1,013 | 1,007 | 0.2% | 108 | 9 | Township |
| Crawford | 13 | 980 | 974 | -0.1% | 44 | 22 | Township |
| Beech Creek | 14 | 962 | 970 | -0.21% | 10 | 96 | Township |
| Chapman | 15 | 902 | 890 | 0.56% | 9 | 100 | Township |
| Logan | 16 | 876 | 875 | -0.11% | 36 | 24 | Township |
| Beech Creek | 17 | 732 | 737 | -0.14% | 1,351 | 1 | Borough |
| Loganton | 18 | 467 | 466 | 0% | 443 | 1 | Borough |
| South Renovo | 19 | 400 | 404 | -0.25% | 1,961 | 0 | Borough |
| Gallagher | 20 | 393 | 389 | 0% | 7 | 54 | Township |
| Noyes | 21 | 334 | 333 | -0.3% | 4 | 89 | Township |
| Salladasburg | 22 | 246 | 250 | -0.4% | 317 | 1 | Borough |
| Colebrook | 23 | 198 | 197 | 0% | 11 | 18 | Township |
| Leidy | 24 | 153 | 153 | 0% | 2 | 97 | Township |
| Grugan | 25 | 50 | 48 | 2.04% | 1 | 68 | Township |
| West Keating | 26 | 18 | 18 | 0% | 0.00 | 38 | Township |
| East Keating | 27 | 9 | 9 | 0% | 0.00 | 51 | Township |
Lock Haven is the largest city in Clinton County, with a population of 8,640.
East Keating is the smallest city in Clinton County, with a population of 9.
There are 27 cities in Clinton County, Pennsylvania.