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720
- The city of Boulder is in the state of Colorado. It has the following active area codes: 720
www.wirefly.com/area-codes/colorado/boulderBoulder, CO Area Codes: List, Map, and Phone Lookup | Wirefly
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List of Colorado area codes. Coordinates: 38°59′50″N105°32′52″W38.9972°N 105.5478°W. Clickable map of Colorado area codes in blue (with bordering states). 1. The U.S. state of Colorado is served by five telephone area codes of the North American Numbering Plan (NANP).
Our area code lookup makes it easy to find area codes in Colorado. Includes area code listings of all Colorado area codes with corresponding cities.
Lookup area code information for BOULDER, CO. Get the NPA NXX (area code and prefix) as well as much more data for BOULDER, CO.
Area codes 303, 720 and 983 are telephone area codes in the North American Numbering Plan for the north-central portion of the U.S. state of Colorado. The numbering plan area comprises Denver and Boulder, as well as their surrounding suburbs, including Lakewood, Littleton, Longmont, Broomfield, Aurora, and Castle Rock.
Find the local area code for Boulder, Colorado. Our complete calling resource guide instantly gives you the the Boulder area code and local time to help you make your long distance call to Boulder, Colorado.
The 303 area code serves Denver, Boulder, Aurora, Golden, Lakewood, Littleton, Englewood and other cities and towns throughout the state. The 303 area code has been split twice since its inception in order to accommodate population growth.
