8 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Kuna | Ada County | 30,427 |
| Kimberly | Twin Falls County | 5,831 |
| Ketchum | Blaine County | 3,644 |
| Kellogg | Shoshone County | 2,536 |
| Kamiah | Lewis County | 1,231 |
| Kootenai | Bonner County | 1,118 |
| Kooskia | Idaho County | 584 |
| Kendrick | Latah County | 300 |