Learn about the 303 area code, including its location, cities, time zone, introduction date, and related area codes.
303 Area Code Details
Major Cities in the 303 Area Code
The 303 area code is associated with the following cities and communities:
- Arvada
- Aurora
- Boulder
- Brighton
- Broomfield
- Castle Rock
- Castlewood
- Columbine
- Commerce City
- Denver
- Englewood
- Highlands Ranch
- Ken Caryl
- Lafayette
- Lakewood
- Littleton
- Longmont
- Loveland
- Northglenn
- Parker
- Southglenn
- Thornton
- Westminster
- Wheat Ridge
Where Is Area Code 303 Located?
The 303 area code serves communities in Colorado. The exact communities and numbering assignments can change as telephone numbering resources are updated.
303 Area Code Time Zone
The 303 area code is associated with the Mountain time zone.
When Was 303 Area Code Introduced?
The 303 area code was introduced in 01-Jan-1947.
How to Call a 303 Area Code Number
For a call within the same numbering plan, dial the required local number according to your carrier’s dialing rules. For calls from outside the United States, use the United States country code (+1), followed by the area code and seven-digit telephone number.
Related Area Codes
303 Area Code FAQ
What state is 303 area code in?
The 303 area code is associated with Colorado.
What time zone is 303 area code in?
The 303 area code is associated with Mountain.
What cities use 303 area code?
Arvada|Aurora|Boulder|Brighton|Broomfield|Castle Rock|Castlewood|Columbine|Commerce City|Denver|Englewood|Highlands Ranch|Ken Caryl|Lafayette|Lakewood|Littleton|Longmont|Loveland|Northglenn|Parker|Southglenn|Thornton|Westminster|Wheat Ridge
More Questions About Area Code 303
What state is area code 303 in?
Area code 303 is associated with Colorado.
What time zone is area code 303 in?
The listed time zone for area code 303 is Mountain.