8 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Kuna | Ada County | 30,280 |
| Kimberly | Twin Falls County | 5,826 |
| Ketchum | Blaine County | 3,621 |
| Kellogg | Shoshone County | 2,471 |
| Kamiah | Lewis County | 1,174 |
| Kootenai | Bonner County | 1,114 |
| Kooskia | Idaho County | 566 |
| Kendrick | Latah County | 307 |