8 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Kuna | Ada County | 31,433 |
| Kimberly | Twin Falls County | 6,061 |
| Ketchum | Blaine County | 3,634 |
| Kellogg | Shoshone County | 2,501 |
| Kamiah | Lewis County | 1,186 |
| Kootenai | Bonner County | 1,146 |
| Kooskia | Idaho County | 577 |
| Kendrick | Latah County | 311 |