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  1. 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.

  2. Boulder County is a county located in the U.S. state of Colorado of the United States. As of the 2020 census, the population was 330,758. [1] The most populous municipality in the county and the county seat is Boulder. [2]

  3. Research Neighborhoods. Home Values, School Zones & Diversity. Instant Data Access! Rank Cities, Towns & ZIP Codes. by Population, Income & Diversity. Sorted by Highest or Lowest! Maps & Driving Directions. to Physical, Cultural & Historic Features.

  4. Sep 1, 2017 · List of all area codes in Boulder, CO. Boulder, CO area code map, list, and phone lookup.

  5. 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.

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

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  8. 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.