9 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Lewiston | Nez Perce County | 34,803 |
| Lincoln | Bonneville County | 3,636 |
| Lapwai | Nez Perce County | 1,258 |
| Letha | Gem County | 715 |
| Lewisville | Jefferson County | 453 |
| Lava Hot Springs | Bannock County | 379 |
| Laclede | Bonner County | 364 |
| Leadore | Lemhi County | 101 |
| Lowman | Boise County | 27 |