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Clickable map of Colorado area codes in blue (with bordering states). The U.S. state of Colorado is served by five telephone area codes of the North American Numbering Plan (NANP). Area code 303 is the original area code assigned to the entire state when the first nationwide telephone numbering plan was created in 1947.
Clickable map of Colorado area codes in blue (with bordering states). 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.
Boulder is a college town of about 106,000 in the Front Range region of Colorado. The home of the University of Colorado, the city has a reputation for progressive values and outdoor recreation. Map.
Sep 1, 2017 · Boulder, CO Area Codes: List, Map, and Phone Lookup. The city of Boulder is in the state of Colorado. It has the following active area codes:
Location of all Area Codes in the US. To faciltiate the millions of phone users, the United States of America is divided into regions known as Area Codes, corresponding to particular geographic telephone dialing areas.
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Boulder, Colorado Area Code. Boulder, CO is officially utilizing an area code overlay in which area codes 303, 720 and 983 serve the same geographic area. Ten digit dialing (area code + seven digit number) is necessary.
