11 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Cherry township | 1 | 1,486 | 1,477 | 0.07% | 26 | 57.96 | Township |
| Colley township | 2 | 610 | 610 | 0% | 10 | 58.26 | Township |
| Davidson township | 3 | 540 | 544 | -0.37% | 7 | 77.86 | Township |
| Dushore | 4 | 450 | 452 | 0% | 571 | 0.79 | Borough |
| Laporte township | 5 | 407 | 405 | -0.25% | 8 | 53.98 | Township |
| Forks township | 6 | 374 | 373 | 0% | 9 | 43.41 | Township |
| Laporte | 7 | 315 | 317 | 0% | 295 | 1.07 | Borough |
| Fox township | 8 | 307 | 310 | -0.32% | 8 | 38.86 | Township |
| Hillsgrove township | 9 | 226 | 229 | -0.44% | 8 | 28.51 | Township |
| Eagles Mere | 10 | 152 | 151 | 0% | 74 | 2.06 | Borough |
| Forksville | 11 | 108 | 110 | 0% | 69 | 1.57 | Borough |
Cherry township is the largest city in Sullivan County, with a population of 1,486.
Forksville is the smallest city in Sullivan County.
There are 11 cities in Sullivan County, Pennsylvania.