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Colorado Area Codes

Colorado has 6 area codes in service: 303, 719, 720, 748, 970 and 983.

DenverColorado SpringsAuroraFort CollinsLakewoodThorntonArvadaWestminsterGreeleyPuebloCentennialBoulderLongmontLovelandBroomfieldCommerce CityGrand JunctionLittletonBrightonWindsorErieNorthglennSecurity-WidefieldEnglewoodPueblo WestWheat RidgeLafayetteFountainEvansJohnstownFour Square MileMontroseLouisvilleFirestoneCliftonDurangoSherrelwoodCimarron HillsFort CarsonFrederickDenverColorado SpringsFort Collins
Largest cities in Colorado

Largest cities

CityArea codes
Denver303, 720, 983
Colorado Springs719
Aurora303, 720, 983
Fort Collins970
Lakewood303, 720, 983
Thornton303, 720, 983
Arvada303, 720, 983
Westminster303, 720, 983
Greeley970, 748
Pueblo719
Centennial303, 720, 983
Boulder720, 303, 983

All area codes in Colorado

CodeMain citiesOverlayIn service sinceProjected exhaust
303Denver, Aurora, Lakewood, Thornton720, 98319472069
719Colorado Springs, Pueblo, Pueblo West, Cañon City—19882035
720Denver, Aurora, Lakewood, Thornton303, 98319982069
748Greeley, Firestone, Durango, Milliken97020252088
970Fort Collins, Greeley, Loveland, Grand Junction74819952088
983Denver, Aurora, Lakewood, Thornton303, 72020222069

3,078 prefixes are in use across Colorado. Exhaust years are NANPA's 2026 forecast.