9 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Lewiston | Nez Perce County | 34,914 |
| Lincoln | Bonneville County | 3,785 |
| Lapwai | Nez Perce County | 1,267 |
| Letha | Gem County | 697 |
| Lewisville | Jefferson County | 461 |
| Lava Hot Springs | Bannock County | 383 |
| Laclede | Bonner County | 246 |
| Leadore | Lemhi County | 102 |
| Lowman | Boise County | 52 |