5 area codes assigned to Colorado · Mountain Time
303
Colorado
Mountain Time
719
Colorado
Mountain Time
720
Colorado
Mountain Time
748
Colorado
Mountain Time
970
Colorado
Mountain Time
Colorado is served by 5 area codes in the North American Numbering Plan (NANP): 303, 719, 720, 748, 970. All Colorado numbers are in the Mountain Time zone. Click any area code above to see the cities and rate centers it covers, formatted tel: link examples, and to search for available phone numbers.