Denver County · Colorado
Denver, CO area codes and time zone
Quick answer
Denver is served by area codes 303, 720, keeps MST time (GMT-7), and sits in county FIPS 08031.
- Area codes
- 303 · 720Within 25 miles of the city centre
- Time zone
- MSTAmerica/Denver
- UTC offset
- GMT-7MDT in summer (UTCGMT-6)
- County FIPS
- 08031Denver County
Dialling from and to Denver
What this means when you pick up the phone.
Because more than one code covers this area, ten-digit dialling applies for local calls: area code plus number, every time. From abroad, dial +1 then the ten digits.
How Denver came to have several area codes
Why one city can carry several codes.
Area codes are assigned to geography, then exhausted as demand grows. Denver — population about 716k — is covered by codes 303, 720, drawn from within 25 miles of the city centre. Because these 2 codes serve the same footprint, they are overlays: the number pool ran low and a new code was layered on top rather than splitting the city apart. All ten digits are required for every local call.
More Denver data
Other Denver datasets on this site.
- Denver population and income
- Denver sales tax rate
- Denver property tax
- Denver cost of living
- Denver home values and rent
- Denver crime rates
- Denver public schools
- Denver weather normals
- Denver commute times
Statewide: Colorado cities · Colorado ZIP codes · Colorado sales tax · Colorado counties