List of counties in Colorado
Encyclopedia : L : LI : LIS : List of counties in Colorado
List of 64 counties in the U.S. state of Colorado:
| State Abbr. | FIPS State Code | State |
| CO
| 08
| Colorado |
| FIPS County Code | County Name | |
| 001 | Adams County — formed in 1902 from part of Arapahoe county. | |
| 003 | Alamosa County — formed in 1913 from parts of Conejos and Costilla counties. | |
| 005 | Arapahoe County — one of the original 17 counties, the first to be incorporated. | |
| 007 | Archuleta County — formed in 1885 from part of Conejos county. | |
| 009 | Baca County — formed in 1889 from part of Las Animas county. | |
| 011 | Bent County — formed in 1874 from part of Greenwood county. | |
| 013 | Boulder County — one of the original 17 counties. | |
| 014 | Broomfield County — formed in 2001 from parts of Adams, Boulder, Jefferson and Weld counties. | |
| 015 | Chaffee County — formed in 1879 from part of Lake county. | |
| 017 | Cheyenne County — formed in 1889 from parts of Bent and Elbert counties. | |
| 019 | Clear Creek County — one of the original 17 counties. | |
| 021 | Conejos County — one of the original 17 counties. Originally also known as Guadalupe county | |
| 023 | Costilla County — one of the original 17 counties. | |
| 025 | Crowley County — formed in 1911 from part of Otero county. | |
| 027 | Custer County — formed in 1877 from part of Fremont county. | |
| 029 | Delta County — formed in 1883 from part of Gunnison county. | |
| 031 | Denver County — formed in 1902 from part of Arapahoe county. | |
| 033 | Dolores County — formed in 1881 from part of San Juan county. | |
| 035 | Douglas County — one of the original 17 counties. | |
| 037 | Eagle County — formed in 1883 from part of Summit county. | |
| 039 | El Paso County — one of the original 17 counties. | |
| 041 | Elbert County — formed in 1874 from parts of Douglas and Greenwood counties. | |
| 043 | Fremont County — one of the original 17 counties. | |
| 045 | Garfield County — formed in 1883 from part of Summit county. | |
| 047 | Gilpin County — one of the original 17 counties. | |
| 049 | Grand County — formed in 1874 from part of Summit county. | |
| 051 | Gunnison County — formed in 1877 from part of Lake county. | |
| 053 | Hinsdale County — formed in 1874 from parts of Conejos and Lake counties. | |
| 055 | Huerfano County — one of the original 17 counties. | |
| 057 | Jackson County — formed in 1909 from part of Larimer county. | |
| 059 | Jefferson County — one of the original 17 counties. | |
| 061 | Kiowa County — formed in 1889 from part of Bent county. | |
| 063 | Kit Carson County — formed in 1889 from part of Elbert county. | |
| 065 | Lake County — one of the original 17 counties. | |
| 067 | La Plata County — formed in 1874 from parts of Conejos and Lake counties. | |
| 069 | Larimer County — one of the original 17 counties. | |
| 071 | Las Animas County — formed in 1866 from part of Huerfano county. | |
| 073 | Lincoln County — formed in 1889 from parts of Bent and Elbert counties. | |
| 075 | Logan County — formed in 1887 from part of Weld county. | |
| 077 | Mesa County — formed in 1883 from part of Gunnison county. | |
| 079 | Mineral County — formed in 1893 from parts of Hindsdale and Rio Grande counties. | |
| 081 | Moffat County — formed in 1911 from part of Routt county. | |
| 083 | Montezuma County — formed in 1889 from part of La Plata county. | |
| 085 | Montrose County — formed in 1883 from part of Gunnison county. | |
| 087 | Morgan County — formed in 1889 from part of Weld county. | |
| 089 | Otero County — formed in 1889 from part of Bent county. | |
| 091 | Ouray County — formed in 1877 from parts of Lake and San Juan counties. | |
| 093 | Park County — one of the original 17 counties. | |
| 095 | Phillips County — formed in 1889 from part of Logan county. | |
| 097 | Pitkin County — formed in 1881 from part of Gunnison county. | |
| 099 | Prowers County — formed in 1889 from part of Bent county. | |
| 101 | Pueblo County — one of the original 17 counties. | |
| 103 | Rio Blanco County — formed in 1889 from part of Garfield county. | |
| 105 | Rio Grande County — formed in 1874 from parts of Conejos and Costilla counties. | |
| 107 | Routt County — formed in 1877 from part of Grand county. | |
| 109 | Saguache County — formed in 1866 from parts of Costilla and Lake counties. | |
| 111 | San Juan County — formed in 1876 from part of Lake county. | |
| 113 | San Miguel County - formed in 1883 from part of Ouray county. | |
| 115 | Sedgwick County - formed in 1889 from part of Logan county. | |
| 117 | Summit County - one of the original 17 counties. | |
| 119 | Teller County - formed in 1899 from part of El Paso county. | |
| 121 | Washington County - formed in 1887 from part of Weld county. | |
| 123 | Weld County - one of the original 17 counties. | |
| 125 | Yuma County - formed in 1889 from part of Washington county. |
New Counties Planned
- The City of Aurora, which is currently located in two counties; Arapahoe, and Adams, is scheduled to become a consolidated city-county (joining Denver and Broomfield as the only city-counties in the state) around 2008.
Defunct counties
- Greenwood County - formed in 1870 from part of Huerfano county and the Arapahoe and Cheyenne Reserve. In 1874 was abolished and Bent and Elbert counties created.
- Platte County - formed in 1872 from part of Weld county. In 1874 was abolished and its territory returned to Weld county.
| Lists of Counties in the United States (Parishes in Louisiana; Boroughs and census areas in Alaska) |
|---|
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