Colorado History and Genealogy Project

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Colorado County List

Adams Brighton 1902-11-15 From Arapahoe County.
Alamosa Alamosa 1913-03-08 From Costilla County and Conejos County counties.
Arapahoe Littleton 1861-11-01 One of the 17 original counties of the Territory of Colorado. Renamed South Arapahoe County November 15, 1902 to April 11, 1903.
Archuleta Pagosa Springs 1885-04-14 From Conejos County.
Baca Springfield 1889-04-16 From Las Animas County.
Bent Las Animas 1870-02-11 From Huerfano County and former Cheyenne and Arapaho tribal land.
Boulder Boulder 1861-11-01 One of the 17 original counties of the Territory of Colorado.
City and  of Broomfield Broomfield 2001-11-15 From Boulder, Adams, Jefferson, and Weld counties. Reorganized as a consolidated city and county.
Chaffee Salida 1879-02-10 From Carbonate County.
Cheyenne Cheyenne Wells 1889-03-25 From Elbert and Bent counties.
Clear Creek Georgetown 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Conejos Conejos 1861-11-01 Guadalupe County, one of the 17 original counties of the Territory of Colorado, was renamed Conejos County after six days on November 7, 1861.
Costilla San Luis 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Crowley Ordway 1911-05-29 From Otero County.
Custer Westcliffe 1877-03-09 From Fremont County.
Delta Delta 1883-02-11 From Gunnison County.
City and County of Denver Denver 1902-11-15 The original Arapahoe County Seat was From Arapahoe County and reorganized as a consolidated city and county.
Dolores Dove Creek 1881-03-04 From Ouray County.
Douglas Castle Rock 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Eagle Eagle 1883-02-11 From Summit County.
El Paso Colorado Springs 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Elbert Kiowa 1874-02-02 From Douglas County.
Fremont Cañon City 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Garfield Glenwood Springs 1883-02-10 From Summit County.
Gilpin Central City 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Grand Hot Sulphur Springs 1874-02-02 From Summit County.
Gunnison Gunnison 1877-03-09 From Lake County.
Hinsdale Lake City 1874-02-10 From Lake, Conejos, and Costilla counties.
Huerfano Walsenburg 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Jackson Walden 1909-05-05 From Larimer County.
Jefferson Golden 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Kiowa Eads 1889-04-11 From Bent County.
Kit Carson Burlington 1889-04-11 From Elbert County.
La Plata Durango 1874-02-10 From Lake and Conejos counties.
Lake Leadville 1861-11-01 One of the 17 original counties of the Territory of Colorado. Renamed Carbonate County for the two days from February 8–10, 1879.
Larimer Fort Collins 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Las Animas Trinidad 1866-02-09 From Huerfano County.
Lincoln Hugo 1889-04-11 From Elbert and Bent counties.
Logan Sterling 1887-02-25 From Weld County.
Mesa Grand Junction 1883-02-14 From Gunnison County.
Mineral Creede 1893-03-27 From Hinsdale, Rio Grande, and Saguache counties.
Moffat Craig 1911-02-27 From Routt County.
Montezuma Cortez 1889-04-16 From La Plata County.
Montrose Montrose 1883-02-11 From Gunnison County.
Morgan Fort Morgan 1889-02-19 From Weld County.
Otero La Junta 1889-03-25 From Bent County.
Ouray Ouray 1877-01-18 From Hinsdale and Lake counties. Renamed Uncompaghre from 1883-02-27, to 1883-03-02.
Park Fairplay 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Phillips Holyoke 1889-03-27 From Logan County.
Pitkin Aspen 1881-02-23 From Gunnison County.
Prowers Lamar 1889-04-11 From Bent County.
Pueblo Pueblo 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Rio Blanco Meeker 1889-03-25 From Garfield County.
Rio Grande Del Norte 1874-02-10 From Costilla County and Conejos County counties.
Routt Steamboat Springs 1877-01-29 From Grand County.
Saguache Saguache 1866-12-29 From Lake and Costilla counties.
San Juan Silverton 1876-01-31 From Lake County.
San Miguel Telluride 1883-03-02 From San Juan County.
Sedgwick Julesburg 1889-04-09 From Logan County.
Summit Breckenridge 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Teller Cripple Creek 1899-03-23 From El Paso and Fremont counties.
Washington Akron 1887-02-09 From Weld County.
Weld Greeley 1861-11-01 One of the 17 original counties of the Territory of Colorado.
Yuma Wray 1889-03-15 From Washington County.

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