Boulder County, Colorado

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Boulder County is the sixth most populous of the 64 counties of the state of Colorado of the United States. The United States Census Bureau estimates that the county population was 282,304 in 2006.[1] The county seat is the City of Boulder. The Boulder Metropolitan Statistical Area comprises Boulder County.



Boulder County was one of the original 17 counties created by the Territory of Colorado on November 1, 1861. The county was named for Boulder City and Boulder Creek, so named because of the abundance of boulders in the area. Boulder County retains essentially the same borders as in 1861, although a 27.5 square miles (71.2 km2)of its southeastern corner and its approximate population of 40,000 became part of the City and County of Broomfield in 2001.


According to the U.S. Census Bureau, the county has a total area of 751 square miles (1,945.1 km2), of which 742 square miles (1,921.8 km2) is land and 9 square miles (23.3 km2) (1.19%) is water.

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