17 cities
| City | County | 2026 Pop. ↓ |
|---|---|---|
| Denver | Denver County | 734,718 |
| Dakota Ridge | Jefferson County | 34,656 |
| Durango | La Plata County | 20,163 |
| Delta | Delta County | 10,000 |
| Derby | Adams County | 8,924 |
| Dacono | Weld County | 6,946 |
| Dove Valley | Arapahoe County | 5,329 |
| Deer Trail | Arapahoe County | 1,883 |
| Dotsero | Eagle County | 1,463 |
| Del Norte | Rio Grande County | 1,386 |
| Dillon | Summit County | 987 |
| Dolores | Montezuma County | 958 |
| Dove Creek | Dolores County | 676 |
| De Beque | Mesa County | 471 |
| Downieville-Lawson-Dumont | Clear Creek County | 451 |
| Dinosaur | Moffat County | 249 |
| Divide | Teller County | 79 |