Area code 720 — Colorado

Area code 720 is in Colorado and serves Denver, Boulder, Longmont, Aurora. Time zone, overlays, counties and ZIP codes.

LocationColorado (Denver, Boulder, Longmont, Aurora, Golden, Limon, Centennial; central Colorado)
Main placesDenver, Boulder, Longmont, Aurora, Golden, Limon, Centennial
StateColorado
StatusIn service · since 1998
Time zoneMountain ·
Overlay codes303983
Overlays share the same area. Local calls usually need 10-digit dialing.
Local dialing10 digits

History

Counties (approximate)

AdamsAdams CountyArapahoeArapahoe CountyBoulderBoulder CountyBroomfield CountyCheyenne CountyClear Creek CountyDenverDenver CountyDouglasDouglas CountyEl PasoElbert CountyGilpin CountyJeffersonJefferson CountyKit Carson CountyLarimer CountyLincoln CountyMorgan CountyPark CountyPhillips CountySedgwick CountyWashington CountyWeld CountyYuma County

ZIP codes in area code 720

Approximate: area code boundaries follow telephone rate centers, not ZIP codes.

80001 Arvada80002 Arvada80003 Arvada80004 Arvada80005 Arvada80006 Arvada80007 Arvada80010 Aurora80011 Aurora80012 Aurora80013 Aurora80014 Aurora80015 Aurora80016 Aurora80017 Aurora80018 Aurora80019 Aurora80020 Broomfield80021 Broomfield80022 Commerce City80023 Broomfield80024 Dupont80025 Eldorado Springs80026 Lafayette80027 Louisville80030 Westminster80031 Westminster80033 Wheat Ridge80034 Wheat Ridge80035 Westminster80036 Westminster80037 Commerce City80038 Broomfield80040 Aurora80041 Aurora80042 Aurora80044 Aurora80045 Aurora80046 Aurora80047 Aurora

Format a 720 number

US numbers are written as (720) 555-0123 or 720-555-0123. From outside the US, dial +1 720 555 0123.

Is a call from 720 a scam?

An area code only tells you where a number was assigned. Caller ID can be faked (“spoofed”), so do not trust a call just because the area code looks local. Never share codes or payment details with unexpected callers.

Sources: NANPA via NumberResearch.org (CC BY 4.0); place names and history from Wikipedia (CC BY-SA 4.0). See data sources.