Territory and State of Colorado
The free Territory of Colorado was officially organized on February 28, 1861. [3] On November 1, 1861, the Colorado Territory 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 and Arapaho Reserve. [4] [5] The Colorado Territory later added 12 more counties for a total of 29, of which 26 still exist. [4] [5]
On August 1, 1876, U.S. President Ulysses S. Grant issued Proclamation 230: Admission of Colorado into the Union. [6] The State of Colorado has created 41 counties of which 38 still exist, for a total of 64 existing counties. [4] [5]
The 64 current and six extinct counties of Colorado and their county seats
- Adams County (November 15, 1902 to present)
- Alamosa County (March 8, 1913 to present)
- Arapahoe County [n] (November 1, 1861 to November 15, 1902; and April 11, 1903, to present)
- Denver City/Denver [a] (⁂Territorial capital February 28, 1861, to July 7, 1862, and December 9, 1867, to August 1, 1876; # state capital since August 1, 1876)
- Littleton [o] – April 11, 1903 to present
- Archuleta County (April 14, 1885 to present)
- Baca County (April 16, 1889 to present)
- Bent County (February 11, 1870 to present)
- Boulder County (November 1, 1861 to present)
- City and County of Broomfield [t] (November 15, 2001 to present)
- Carbonate County ‡ [u] (February 8, 1879 to February 10, 1879)
- Chaffee County [u] (February 10, 1879 to present)
- Cheyenne County (March 25, 1889 to present)
- Clear Creek County (November 1, 1861 to present)
- Conejos County [ab] (November 7, 1861 to present)
- Costilla County (November 1, 1861 to present)
- Crowley County (May 29, 1911 to present)
- Custer County (March 9, 1877 to present)
- Delta County (February 11, 1883 to present)
- City and County of Denver (December 1, 1902 to present)
- Denver [a] (# State capital since August 1, 1876)
- Dolores County (March 4, 1881 to present)
- Douglas County (November 1, 1861 to present)
- Eagle County (February 11, 1883 to present)
- El Paso County (November 1, 1861 to present)
- Elbert County (February 2, 1874 to present)
- Fremont County (November 1, 1861 to present)
- Garfield County (February 10, 1883 to present)
- Gilpin County (November 1, 1861 to present)
- Grand County (February 2, 1874 to present)
- Greenwood County ‡ [az] (February 11, 1870 to February 6, 1874)
- Guadaloupe County ‡ [ab] (November 1, 1861 until renamed Conejos County six days later)
- Gunnison County (March 9, 1877 to present)
- Hinsdale County (February 10, 1874 to present)
- Huerfano County (November 1, 1861 to present)
- Jackson County (May 5, 1909 to present)
- Jefferson County (November 1, 1861 to present)
- Kiowa County (April 11, 1889 to present)
- Kit Carson County (April 11, 1889 to present)
- La Plata County (February 10, 1874 to present)
- Lake County [u] (November 1, 1861 to February 8, 1879; and February 10, 1879, to present)
- Larimer County (November 1, 1861 to present)
- Las Animas County (February 9, 1866 to present)
- Lincoln County (April 11, 1889 to present)
- Logan County - February 25, 1887 to present)
- Mesa County (February 14, 1883 to present)
- Mineral County - (March 27, 1893 to present)
- Moffat County (February 27, 1911 to present)
- Montezuma County (April 16, 1889 to present)
- Montrose County (February 11, 1883 to present)
- Morgan County (February 19, 1889 to present)
- Otero County (March 25, 1889 to present)
- Ouray County [cd] (January 18, 1877 to February 27, 1883; and March 2, 1883, to present)
- Park County (November 1, 1861 to present)
- Phillips County (March 27, 1889 to present)
- Pitkin County (February 23, 1881 to present)
- Platte County ‡ (February 9, 1872 to February 9, 1874)
- Platte County failed to organize and reverted to the eastern portion of Weld County.
- Prowers County (April 11, 1889 to present)
- Pueblo County (November 1, 1861 to present)
- Rio Blanco County (March 25, 1889 to present)
- Rio Grande County (February 10, 1874 to present)
- Routt County (January 29, 1877 to present)
- Saguache County [cp] (December 29, 1866 to present)
- San Juan County (January 31, 1876 to present)
- San Miguel County (March 2, 1883 to present)
- Sedgwick County (April 9, 1889 to present)
- South Arapahoe County ‡ [n] (November 15, 1902 to April 11, 1903)
- Summit County (November 1, 1861 to present)
- Teller County (March 23, 1899 to present)
- Uncompahgre County ‡ [cd] (February 27, 1883 to March 2, 1883)
- Washington County (February 9, 1887 to present)
- Weld County (November 1, 1861 to present)
- Yuma County (March 15, 1889 to present)
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