Colorado Dialing Codes, Country Codes and Area Codes
| City | Country Codes | Area Codes | Dialing Codes |
|---|---|---|---|
| Arvada | +1 | 720 | +1 720 |
| Aspen | +1 | 970 | +1 970 |
| Aurora | +1 | 630 | +1 630 |
| Boulder | +1 | 303 | +1 303 |
| Brighton | +1 | 303 | +1 303 |
| Broomfield | +1 | 720 | +1 720 |
| Canon City | +1 | 719 | +1 719 |
| Castle Rock | +1 | 303 | +1 303 |
| Colorado Springs | +1 | 719 | +1 719 |
| Commerce City | +1 | 303 | +1 303 |
| Denver | +1 | 303 | +1 303 |
| Durango | +1 | 970 | +1 970 |
| Englewood | +1 | 720 | +1 720 |
| Erie | +1 | 814 | +1 814 |
| Fort Collins | +1 | 970 | +1 970 |
| Golden | +1 | 303 | +1 303 |
| Grand Junction | +1 | 970 | +1 970 |
| Greeley | +1 | 970 | +1 970 |
| Lafayette | +1 | 337 | +1 337 |
| Lakewood | +1 | 303 | +1 303 |
| Littleton | +1 | 720 | +1 720 |
| Longmont | +1 | 720 | +1 720 |
| Louisville | +1 | 502 | +1 502 |
| Loveland | +1 | 970 | +1 970 |
| Montrose | +1 | 970 | +1 970 |
| Parker | +1 | 303 | +1 303 |
| Pueblo | +1 | 719 | +1 719 |
| Westminster | +1 | 720 | +1 720 |
| Wheat Ridge | +1 | 303 | +1 303 |
| Windsor | +1 | 519 | +1 519 |
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