Arapahoe (KS) County, Colorado Genealogy

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United States Gotoarrow.png Colorado Gotoarrow.png Arapahoe (KS) County

Arapahoe County, Kansas Territory was created 25 August 1855.[1]

On 7 February 1859, the following daughter counties were created from parts of the old Arapahoe County, Kansas:[2]

  • Arapahoe County, Kansas Territroy (east sides of modern Adams, Arapahoe, and Elbert, and parts of Washington, Lincoln, Crowley, Otero, Bent counties in Colorado)
  • Broderick County, Kansas Territory (modern Pueblo County, eastern Fremont and Custer, and southern El Paso counties, Colorado)
  • El Paso County, Kansas Territory (northwestern El Paso, southern Douglas and Teller counties, Colorado)
  • Fremont County, Kansas Territory (southern Park and Chaffee, Fremont, northern Custer and Saguache counties, Colorado)
  • Montana County, KansasTerritory (southern Boulder, Jefferson, Gilpin, Clear Creek, Denver, northern Douglas and Park, western Arapahoe and Adams counties, Colorado)
  • Oro County, Kansas Territory (central Adams, Arapahoe, and Elbert, and northwestern El Paso counties, Colorado)

When Colorado was organized 28 February 1861 its core included all parts of the original (Kansas) Arapahoe County. At that time three daughter counties were replaced, Broderick, Montana, and Oro, and their names were discontinued. The three other daughter counties remained, but with significantly modified borders.

At least part of these modern Colorado counties were in the original Kansas version of Arapahoe County: Adams, Arapahoe, Bent, Boulder, Chaffee, Cheyenne, Clear Creek, Crowley, Custer, Denver, Douglas, El Paso, Elbert, Gilpin, Fremont, Jefferson Kiowa, Kit Carson, Lake, Lincoln, Otero, Park, Pueblo, Saguache, Teller, and Washington counties.

Colorado 1860 map.png


  1. Wikipedia contributors, "Arapahoe County, Colorado" in Wikipedia: the Free Encyclopedia at,_Colorado (accessed 19 June 2012).
  2. Adrian B. Ettlinger, AniMap 3.0 : with SiteFinder U.S. place name database (Alamo, Calif.: Gold Bug, 2008), Colorado 1859 map. At various libraries (WorldCat); FHL CD-ROM no. 4903.