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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 a home rule city in and the county seat of...
- Boulder, Colorado
Boulder is a home rule city in and the county seat of Boulder County, Colorado, United States. [1] With a population of 108,250 at the 2020 census, it is the most-populous city in the county and the 12th-most populous city in Colorado. [6] Boulder is the principal city of the Boulder metropolitan statistical area, which had 330,758 residents in ...
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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. Area Codes >. Colorado >. Boulder. The city of Boulder is in the state of Colorado. It has the following active area codes: 720.
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 .
Created conflicts in area code regions that allowed seven-digit dialling and had been using numbers beginning in 988; a total of 82 area codes switched to ten-digit dialling as a result. 989: Michigan (Alpena, Mt. Pleasant, Bay City, Saginaw, Midland, Owosso, and a part of central Michigan) April 7, 2001: split of 517; 990–999
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There are 4 active area codes in the state of Colorado. Each of these area codes are listed below. There are two lists that Wirefly provides for the area codes in Colorado. The first table below shows the most populated cities in Colorado with the area codes listed next to them. The next table shows the all the Colorado state area codes by ...
