10 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Ken Caryl | Arapahoe County | 33,631 |
| Keenesburg | Weld County | 2,451 |
| Kersey | Weld County | 1,493 |
| Kremmling | Grand County | 1,398 |
| Keystone | Summit County | 1,118 |
| Kittredge | Jefferson County | 737 |
| Kiowa | Elbert County | 733 |
| Kit Carson | Cheyenne County | 239 |
| Kim | Las Animas County | 66 |
| Kirk | Yuma County | 36 |