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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.
- Boulder, Colorado
Boulder is the principal city of the Boulder metropolitan...
- Boulder, Colorado
Boulder is the principal city of the Boulder metropolitan statistical area, which had 330,758 residents in 2020, and is part of the Front Range Urban Corridor. Boulder is located at the base of the foothills of the Rocky Mountains , at an elevation of 5,430 feet (1,655 m) above sea level.
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Area code 303 was one of the original North American area codesof 1947, and originally served the entire state of Colorado. It remained the state's sole area code for 40 years. Colorado's explosive growth in the second half of the 20th century, particularly in the Denver/Boulder area, made it a certainty that Colorado would need another area code. ...
The numbering plan area is one of the largest toll-free calling zones in the western United States.[citation needed] With the exception of Roggen, Brighton, and Wiggins,[failed verification]no long-distance charges are levied for any calls made from one telephone to another in the area.
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:
Colorado Area Code Map. Try the Printable Colorado Area Code Map. Colorado currently utilizes 5 area codes. When first established by AT&T and the Bell System in 1947, 303 covered the entire state of Colorado. The most recently added was 983 in 2022 as an overlay to 303.
Colorado area code map, list, and phone lookup for all cities in Colorado.
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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. In addition to Boulder, CO area code information read more about area codes 303, 720, 983 details and Colorado area codes.
