11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Annual Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Cherry | 1 | 1,511 | 1,477 | 0.07% | 26 | 58 | Township |
| Colley | 2 | 616 | 612 | -0.32% | 11 | 58 | Township |
| Davidson | 3 | 553 | 545 | 0% | 7 | 78 | Township |
| Dushore | 4 | 459 | 454 | 0.22% | 582 | 1 | Borough |
| Laporte | 5 | 425 | 406 | 0.95% | 8 | 54 | Township |
| Forks | 6 | 379 | 375 | -0.26% | 9 | 43 | Township |
| Laporte | 7 | 319 | 314 | 0.31% | 299 | 1 | Borough |
| Fox | 8 | 312 | 310 | -0.32% | 8 | 39 | Township |
| Hillsgrove | 9 | 231 | 229 | 0% | 8 | 29 | Township |
| Eagles Mere | 10 | 155 | 150 | 0.65% | 75 | 2 | Borough |
| Forksville | 11 | 112 | 111 | 0% | 71 | 2 | Borough |
Cherry is the largest city in Sullivan County, with a population of 1,511.
Forksville is the smallest city in Sullivan County, with a population of 112.
There are 11 cities in Sullivan County, Pennsylvania.