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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. The most populous municipality in the county and the county seat is Boulder.
On November 1, 1861, the new Territory of Colorado created 17 original counties: Arapahoe, Boulder, Clear Creek, Costilla, Douglas, El Paso, Fremont, Gilpin, Guadalupe, Huerfano, Jefferson, Lake, Larimer, Park, Pueblo, Summit, and Weld; plus the Cheyenne Reserve.
CountyFips Code [5] [b]County Seat [6] [7]Est. [8]1902-11-151913-03-081861-11-011885-04-14Interactive Map of Colorado Counties. Click on any of the counties on the map to see its population, economic data, time zone, and zip code (the data will appear below the map ). Data is sourced from the US Census 2021.
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. [a] This list also details the county population changes since the 2000 United States Census .
Apr 4, 2023 · A map of Colorado counties showcases the 64 counties that make up the state, including the major metropolitan areas of Denver, Boulder, and Colorado Springs.
Boulder County encompasses 740 square miles of the western plains and Rocky Mountains in north central Colorado. The county straddles three unique geographic zones: mountains in the west, plains in the east, and a natural trough that runs between the plains and foothills.
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A map of Colorado Counties with County seats and a satellite image of Colorado with County outlines.
