9 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Fruitland | Payette County | 7,560 |
| Filer | Twin Falls County | 3,166 |
| Fort Hall | Bingham County | 2,145 |
| Franklin | Franklin County | 1,178 |
| Firth | Bingham County | 552 |
| Fairfield | Camas County | 502 |
| Fernwood | Benewah County | 160 |
| Fernan Lake Village | Kootenai County | 157 |
| Ferdinand | Idaho County | 144 |