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Colorado area codes

The state of Colorado, USA is currently served by a total of 4 area codes:

Overlaying area codes

These Colorado area codes overlay (cover the same geographic area). The first code listed is the parent code. Overlay area codes are added when no more phone numbers are available in an existing Numbering Plan Area.

  • 303/720

Larger Colorado cities and their area codes

City CountyArea code(s)
ArvadaJefferson 303/720
AuroraAdams 303/720
BoulderBoulder 303/720
BrightonAdams 303/720
BroomfieldBroomfield 303/720
Castle RockDouglas 303/720
Colorado SpringsEl Paso 719
Commerce CityAdams 303/720
DenverAdams 303/720
EnglewoodArapahoe 303/720
Fort CollinsLarimer 970
FountainEl Paso 719
Grand JunctionMesa 970
GreeleyWeld 970
Highlands RanchDouglas 303/720
LafayetteBoulder 303/720
LakewoodJefferson 303/720
LittletonArapahoe 303/720
LongmontBoulder 303/720
LovelandLarimer 970
ParkerDouglas 303/720
PuebloPueblo 719
ThorntonAdams 303/720
WestminsterAdams 303/720
Wheat RidgeJefferson 303/720
WindsorWeld 970