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  1. List of Colorado area codes. Coordinates: 38.9972°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).

  2. this was the first part of North America to have its code changed three times: from 213 to 714 1951: to 619 in 1982, and to 760 in 1997. was to have originally split off the portion of 760 serving San Diego County to a new 442 area code in late 2008/early 2009; that plan was cancelled. 2009: overlaid by 442. 761.

  3. The regions shown in blue are in Ohio. This is a list of area codes in the state of Ohio.

  4. 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:

  5. Get information about area code of Boulder County in Colorado. Also find all the counties located in Colorado through area codes map.

  6. Boulder: 303 and 720 Nestled against the Rocky Mountains, Boulder shares the 303 and 720 area codes with Denver. Known for its outdoor adventures, vibrant arts scene, and the University of Colorado, Boulder is a hub of innovation and culture.

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  8. Lookup area codes in BOULDER County, CO. Get NPA NXX (area code and prefix) information for BOULDER County, CO.

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