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Colorado area codes

The state of Colorado, USA is currently served by a total of 5 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.

  • 303/720/983

Larger Colorado cities and their area codes

City CountyArea code(s)
ArvadaJefferson 303/720/983
AuroraAdams 303/720/983
BoulderBoulder 303/720/983
BrightonAdams 303/720/983
BroomfieldBroomfield 303/720/983
Castle RockDouglas 303/720/983
Colorado SpringsEl Paso 719
Commerce CityAdams 303/720/983
DenverAdams 303/720/983
EnglewoodArapahoe 303/720/983
Fort CollinsLarimer 970
FountainEl Paso 719
Grand JunctionMesa 970
GreeleyWeld 970
Highlands RanchDouglas 303/720/983
LafayetteBoulder 303/720/983
LakewoodJefferson 303/720/983
LittletonArapahoe 303/720/983
LongmontBoulder 303/720/983
LovelandLarimer 970
ParkerDouglas 303/720/983
PuebloPueblo 719
ThorntonAdams 303/720/983
WestminsterAdams 303/720/983
Wheat RidgeJefferson 303/720/983
WindsorWeld 970