7 cities
| City | Rank | 2025 Pop. ↓ | 2020 Pop. | Change | Density | Area (mi²) | Type |
|---|---|---|---|---|---|---|---|
| Jenks township | 1 | 3,207 | 3,844 | -3.4% | 38 | 84.44 | Township |
| Marienville | 2 | 3,204 | 3,538 | 0.13% | 529 | 6.06 | CDP |
| Tionesta township | 3 | 623 | 664 | -1.42% | 14 | 44.98 | Township |
| Tionesta | 4 | 405 | 430 | -1.22% | 295 | 1.38 | Borough |
| Green township | 5 | 348 | 369 | -1.42% | 8 | 42.12 | Township |
| Barnett township | 6 | 290 | 308 | -1.36% | 8 | 34.34 | Township |
| Howe township | 7 | 193 | 201 | -1.03% | 2 | 87.50 | Township |
Jenks township is the largest city in Forest County, with a population of 3,207.
Howe township is the smallest city in Forest County.
There are 7 cities in Forest County, Pennsylvania.