Area Codes in Colorado
6 active area codes · United States · Mountain Time
Colorado has 6 active area codes in the North American Numbering Plan: 303, 719, 720, 748, 970, 983. All area codes in Colorado observe Mountain Time.
6
Area Codes
1
Time Zone
5
Overlay Codes
303
Denver
Overlay
Mountain
719
Alamosa
Mountain
720
Denver
Overlay
Mountain
748
Overlay
Mountain
970
Fort Collins
Overlay
Mountain
983
Denver
Overlay
Mountain
About Colorado Area Codes
Colorado currently has 6 active area codes in the North American Numbering Plan: 303, 719, 720, 748, 970, 983. These operate in the Mountain Time time zone.