17 cities
| City | County | 2025 Pop. ↓ |
|---|---|---|
| Denver | Adams County | 731,868 |
| Dakota Ridge | Jefferson County | 34,791 |
| Durango | La Plata County | 19,987 |
| Delta | Delta County | 9,844 |
| Derby | Adams County | 9,340 |
| Dacono | Weld County | 6,847 |
| Dove Valley | Arapahoe County | 5,651 |
| Deer Trail | Arapahoe County | 1,753 |
| Del Norte | Rio Grande County | 1,398 |
| Dotsero | Eagle County | 1,310 |
| Dillon | Summit County | 1,000 |
| Dolores | Montezuma County | 947 |
| Dove Creek | Dolores County | 669 |
| Downieville-Lawson-Dumont | Clear Creek County | 549 |
| De Beque | Mesa County | 474 |
| Dinosaur | Moffat County | 248 |
| Divide | Teller County | 143 |