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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. Clickable map of Colorado area codes in blue (with bordering states). Area codes 303, 720 and 983 are telephone area codes in the North American Numbering Plan for the north-central portion of the U.S. state of Colorado.

  3. 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.

  4. 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.

  5. Find local businesses, view maps and get driving directions in Google Maps.

  6. Find out how many area codes in Colorado including largest cities/towns covered. Copyright © 2005 - 2024 24TimeZones.com. All rights reserved.

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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.