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  1. 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]

  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.

  3. For United States Census Bureau population estimates for Colorado counties as of July 1, 2023, see the List of Colorado counties by population. That list ranks the counties by 2023 population and includes population changes since the 2000 United States Census.

  4. 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.

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

  6. List of counties in Colorado. The U.S. state of Colorado has a total of 64 counties. Two of these counties, the City and County of Denver and the City and County of Broomfield, have consolidated city and county governments . Colorado's postal abbreviation is CO and its FIPS code is 08 .

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  8. This list ranks the 64 counties of the U.S. State of Colorado by population as of July 1, 2023, as estimated by the United States Census Bureau. This list also details the county population changes since the 2000 United States Census.