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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. 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. The numbering plan area comprises Denver and Boulder, as well as their surrounding suburbs, including Lakewood, Littleton, Longmont, Broomfield, Aurora, and Castle Rock.

  3. 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]

  4. Find the local area code for Boulder, Colorado. Our complete calling resource guide instantly gives you the the Boulder area code and local time to help you make your long distance call to Boulder, Colorado.

  5. 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:

  6. Sep 22, 2023 · The 303 area code is more than just a numerical prefix; it’s the heartbeat of Colorado. In this blog post, we’ll delve into the history, significance, and unique attributes of the 303 area code, which has become synonymous with the Centennial State.

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  8. Boulder is a city in the state of Colorado, in the United States. It is the county seat [8] of Boulder County. Boulder is in the foothills of the Rocky Mountains. The city's height is 5,430 feet (1,660 m). It is 25 miles (40 km) northwest of Denver. In 2020, there were 108,250 people living the City of Boulder. [9]

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