Area code lookup
What area code is 303?
Here's everything about it.
Instant lookup for the 303 area code — location, time zone, cities served, and who's been calling from it. No sign-up, no app.
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Caller ID · NPA-NXX-XXXXLive
Area code
303
Location
Denver, CO
Local time
--:--:-- --
Denver
303 at a glance
SummaryState
Colorado
Time zone
Mountain (MT)
UTC offset
UTC−7 / −6 DST
Observes DST
Yes
Country
United States
Cities served by 303
DenverDenver
Where 303 sits on the map
No overlayCoverage area
About the 303 region
303 covers Denver in Colorado. It currently has no overlay code, so seven-digit dialing may still be possible within the region.
Who called me from 303?
Community reportsNo community reports for 303 numbers yet. Be the first to report one.
Got a call from 303 that isn't listed?
Frequently asked questions
FAQWhat area code is 303?+–
303 is a telephone area code serving Denver in Colorado, United States.
Where is area code 303 located?+–
It covers Denver in Colorado.
What time zone is 303?+–
303 observes Mountain (MT), which is UTC−7 / −6 DST and follows daylight saving time.
Can I get a 303 phone number?+–
Yes — most mobile carriers and VoIP providers let you request a 303 number regardless of where you physically live.