| CIDADE | CÓDIGO DDI |
| Arvada | 1 303 |
| Aurora | 1 303 |
| Boulder | 1 303 |
| Canon City | 1 719 |
| Colorado Springs | 1 719 |
| Commerce City | 1 303 |
| Cortez | 1 970 |
| Craig | 1 970 |
| Denver | 1 303 |
| Durango | 1 970 |
| Englewood | 1 303 |
| Fort Collins | 1 970 |
| Fort Morgan | 1 970 |
| Fountain | 1 719 |
| Golden | 1 303 |
| Grand Junction | 1 970 |
| Grant | 1 303 |
| Greeley | 1 970 |
| La Junta | 1 719 |
| Lafayette Louisville | 1 303 |
| Lake City | 1 970 |
| Lakewood | 1 303 |
| Lamar | 1 719 |
| Littleton | 1 303 |
| Longmont | 1 303 |
| Loveland | 1 970 |
| Montrose | 1 970 |
| Pueblo | 1 719 |
| Sterling | 1 970 |
| Trinidad | 1 719 |
