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• Directory of Area Codes By City/State -> Colorado Calling Codes
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M Area Codes For Colorado
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| City Name: | Area Code: |
| Hamilton | 970 |
| Hartman | 719 |
| Hartsel | 719 |
| Hasty | 719 |
| Haswell | 719 |
| Haxtun | 970 |
| Hayden | 970 |
| Henderson | 303 |
| Hereford | 303 |
| Hesperus | 970 |
| Highlands Ranch | 303 |
| Hillrose | 970 |
| Hillside | 719 |
| Hoehne | 719 |
| Holly | 719 |
| Holyoke | 970 |
| Homelake | 719 |
| Hooper | 719 |
| Hot Sulphur Springs | 970 |
| Hotchkiss | 970 |
| Howard | 719 |
| Hudson | 303 |
| Hugo | 719 |
| Hygiene | 303 |
