10 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Ken Caryl | Arapahoe County | 33,772 |
| Keenesburg | Weld County | 2,252 |
| Kersey | Weld County | 1,496 |
| Kremmling | Grand County | 1,417 |
| Keystone | Summit County | 974 |
| Kittredge | Jefferson County | 950 |
| Kiowa | Elbert County | 733 |
| Kit Carson | Cheyenne County | 242 |
| Kirk | Yuma County | 94 |
| Kim | Las Animas County | 65 |