11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Cherry | 1 | 1,486 | 1,477 | 0.07% | 26 | 58 | Township |
| Colley | 2 | 610 | 610 | 0% | 10 | 58 | Township |
| Davidson | 3 | 540 | 544 | -0.37% | 7 | 78 | Township |
| Dushore | 4 | 450 | 452 | 0% | 571 | 1 | Borough |
| Laporte | 5 | 407 | 405 | -0.25% | 8 | 54 | Township |
| Forks | 6 | 374 | 373 | 0% | 9 | 43 | Township |
| Laporte | 7 | 315 | 317 | 0% | 295 | 1 | Borough |
| Fox | 8 | 307 | 310 | -0.32% | 8 | 39 | Township |
| Hillsgrove | 9 | 226 | 229 | -0.44% | 8 | 29 | Township |
| Eagles Mere | 10 | 152 | 151 | 0% | 74 | 2 | Borough |
| Forksville | 11 | 108 | 110 | 0% | 69 | 2 | Borough |
Cherry is the largest city in Sullivan County, with a population of 1,486.
Forksville is the smallest city in Sullivan County, with a population of 108.
There are 11 cities in Sullivan County, Pennsylvania.