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Colorado Counties

Colorado currently has sixty-four counties. The Counties of Colorado are important components of government since the state has no secondary civil subdivisions such as townships. Two counties, the City and County of Denver and the City and County of Broomfield, have consolidated city and county governments.. No organized Counties of the District of Louisiana, the Territory of Missouri, or the Territory of Nebraska existed within the present boundaries of the State of Colorado.

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Jefferson County, Colorado

Jefferson County History, Geography, and Demographics

County Seat: Golden
Year Organized: 1861
Square Miles: 772
Court House:

100 Jefferson County Parkway
County Government Center
Golden, CO 80419-5550

Etymology - Origin of County Name

Jefferson County is named for its extralegal predecessor county, Jefferson County, Jefferson Territory, which in turn was named in honor of Thomas Jefferson, the author of the Declaration of Independence and the third President of the United States.

Demographics:

County QuickFacts: Census Bureau Quick Facts

County History

On 1855-08-25, the Kansas Territorial Legislature created Arapahoe County to govern the entire western portion of the Territory of Kansas. The county was named for the Arapaho Nation of Native Americans that lived in the region.

The Jefferson Territory never received federal sanction, but on 1861-02-28, U.S. President James Buchanan signed an act organizing the Territory of Colorado. On 1861-11-01, the Colorado General Assembly organized the 17 original counties of Colorado including a new Jefferson County. In 1908, the southern tip of Jefferson County was transferred to Park County, reducing Jefferson County to its present length of 54 miles (87 kilometers). Several annexations by the City and County of Denver and the 2001 consolidation of the City and County of Broomfield removed eastern portions of the county.

Geography

Jefferson County spans 4 to 18 miles (6 to 30 kilometers) west to east and 54 miles (87 kilometers) north to south. According to the U.S. Census Bureau, the county has a total area of 778 square miles (2,015 kmē), of which, 772 square miles (2,000 kmē) of it is land and 6 square miles (15 kmē) of it (0.77%) is water.

Neighboring Counties:

  • North: Boulder County
  • Northeast: Denver city & county; Adams County
  • East: Arapahoe County
  • Southeast: Douglas County
  • South: Teller County
  • Southwest: Park County
  • Northwest: Clear Creek County; Gilpin County
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