9 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Fruitland | Payette County | 7,392 |
| Filer | Twin Falls County | 3,079 |
| Fort Hall | Bingham County | 2,460 |
| Franklin | Franklin County | 1,180 |
| Firth | Bingham County | 555 |
| Fairfield | Camas County | 516 |
| Fernwood | Benewah County | 182 |
| Fernan Lake Village | Kootenai County | 158 |
| Ferdinand | Idaho County | 148 |