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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. Boulder is a home rule city in and the county seat of Boulder County, Colorado, United States. 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]

  3. 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:

  4. Media in category "Maps of Boulder County, Colorado" The following 63 files are in this category, out of 63 total.

  5. Boulder. Type: County with 331,000 residents. Description: county in Colorado, United States. Categories: county of Colorado and locality. Location: Colorado, Rocky Mountains, United States, North America. View on Open­Street­Map. Latitude. 40.1026° or 40° 6' 9" north. Longitude.

  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. San Juan County (16), Hinsdale County (25), Mineral County (32), Jackson County (55), Kiowa County (59), and Cheyenne County (80) are among the 100 least populous counties of the United States. 3. Jefferson County borders ten adjacent counties, the most of any Colorado county. [k] 4.