Area Code 303  is assigned to the following locations in: Colorado

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1. Boulder
2. Longmont
3. Aurora
4. Denver
5. Highlands
6. Ranch
   

This is the complete Area Code Finder list of telephone area codes in the major cities assigned to the 303 Area Code

This area code locator is the most complete and current area code look up directory online. If you have completed your area code search and have found that your city is not located here, use the closest major city's area code. If you would like to add your city's area code to this website, simply send an email with your city's name, state and area code to: newlocation@areacodefinder.us