15 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Lock Haven | 1 | 8,699 | 8,093 | 1.41% | 3,485 | 2.50 | City |
| Pine Creek township | 2 | 3,348 | 3,408 | -0.56% | 232 | 14.41 | Township |
| Lamar township | 3 | 2,569 | 2,614 | -0.46% | 63 | 40.89 | Township |
| Bald Eagle township | 4 | 1,996 | 2,036 | -0.55% | 48 | 41.63 | Township |
| Greene township | 5 | 1,781 | 1,764 | 0% | 38 | 46.77 | Township |
| Porter township | 6 | 1,478 | 1,488 | -0.4% | 58 | 25.56 | Township |
| Avis | 7 | 1,452 | 1,471 | -0.27% | 2,933 | 0.49 | Borough |
| Mill Hall | 8 | 1,451 | 1,473 | -0.27% | 1,575 | 0.92 | Borough |
| Flemington | 9 | 1,259 | 1,268 | -0.16% | 2,761 | 0.46 | Borough |
| Castanea township | 10 | 1,078 | 1,099 | -0.55% | 196 | 5.51 | Township |
| Renovo | 11 | 1,040 | 1,057 | -0.29% | 990 | 1.05 | Borough |
| Beech Creek | 12 | 726 | 738 | -0.27% | 1,339 | 0.54 | Borough |
| Loganton | 13 | 461 | 466 | -0.22% | 438 | 1.05 | Borough |
| South Renovo | 14 | 400 | 405 | -0.25% | 1,961 | 0.20 | Borough |
| Salladasburg | 15 | 243 | 250 | -0.41% | 313 | 0.78 | Borough |
Lock Haven is the largest city in Clinton County, with a population of 8,699.
Salladasburg is the smallest city in Clinton County.
There are 15 cities in Clinton County, Pennsylvania.