Colorado County Creation Dates and Parent CountiesEdit This Page

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Name of County Date Formed Parent County Progeny County
Adams 15 Apr 1861 Colorado Territory none
Alamosa 08 Mar 1913 Costilla, Conejos none
Arapahoe 01 Nov 1861 Colorado Territory Denver 1901, Washington 1887, Yuma 1889
Archuleta 14 Apr 1885 Conejos none
Baca 16 Apr 1889 Los Animas none
Boulder 01 Nov 1861 Colorado Territory none
City and County of Broomfield 15 Nov 2001 Adams, Boulder, Jefferson, Weld none
Carbonate 01 Nov 1861 Colorado Territory renamed Lake 1879
Chaffee 10 Feb 1879 Lake none
Cheyenne 25 Mar 1889 Bent, Elbert Kiowa 1889
Clear Creek 01 Nov 1861 Colorado Territory none
Conejos 01 Nov 1861 Colorado Territory Alamosa 1913, Archuleta 1885, Hinsdale 1874, La Plata 1874, Rio Grande 1874
Costilla 01 Nov 1861 Colorado Territory Alamosa 1913, Rio Grande 1874, Saguache 1866
Crowley 29 May 1911
Bent, Otero none
Custer 09 Mar 1877 Fremont none
Delta 11 Feb 1883 Gunnison none
City and County of Denver 18 Mar 1901 Arapahoe none
Dolores 19 Feb 1881 Ouray none
Douglas 01 Nov 1861 Colorado Territory Elbert 1874
Eagle 11 Feb 1883 Summit none
Elbert 02 Feb 1874 Douglas Kit Carson 1889, Lincoln 1889
El Paso 01 Nov 1861 Colorado Territory Teller 1899
Fremont 01 Nov 1861 Colorado Territory Custer 1877
Garfield 10 Feb 1883 Summit none
Gilpin 01 Nov 1861 Colorado Territory none
Guadalupe 01 Nov 1861 Colorado Territory renamed Conejos 1861
Gunnison 09 Mar 1877 Lake Delta 1883, Mesa 1883, Montrose 1883, Pitkin 1881
Hinsdale 10 Feb 1874 Conejos Mineral 1893, Ouray 1877, Uncompahgre 1877
Huerfano 01 Nov 1861 Colorado Territory Los Animas 1866
Jackson 05 May 1909
Grand, Larimer none
Jefferson 01 Nov 1861 Colorado Territory none
Kiowa 11 Apr 1889 Cheyenne, Bent none
Kit Carson 11 Apr 1889 Elbert none
Lake 10 Feb 1879 renamed from Carbonate Chaffee 1879, Gunnison 1877
La Plata 10 Feb 1874 Conejos, Lake Montezuma 1889, San Juan 1876
Larimer 01 Nov 1861 Colorado Territory Jackson 1909
Las Animas 09 Nov 1866 Huerfano Baca 1889
Lincoln 11 Apr 1889 Elbert none
Logan 02 Feb 1887 Weld Phillips 1889, Sedgwick 1889
Mesa 14 Feb 1883 Gunnison none
Mineral 27 Mar 1893 Hinsdale none
Moffat 27 Feb 1911 Routt none
Montezuma 16 Apr 1889 La Plata none
Montrose 11 Feb 1883 Gunnison none
Morgan 19 Feb1 889 Weld none
Otero 19 Feb 1889 Bent Crowley 1911
Ouray 02 Mar 1883 renamed from Uncompahgre Dolores 1881, San Miguel 1861
Park 01 Nov 1861 Colorado Territory none
Phillips 27 Mar 1889 Logan none
Pitkin 23 Feb 1881 Gunnison none
Prowers 11 Apr 1889 Bent none
Pueblo 01 Nov 1861 Colorado Territory none
Rio Blanco 25 Mar 1889 Summit none
Rio Grande (del Norte) 10 Feb 1874 Conejos, Costilla none
Routt 29 Jan 1877 Grand Moffatt 1911
Saguache 29 Dec 1866 Costilla none
San Juan 31 Jan 1876 La Plata Uncompahgre 1877
San Miguel 01 Nov 1861 Colorado Territory none
Sedgwick 09 Apr 1889 Logan none
Summit 01 Nov 1861 Colorado Territory Eagle 1883, Garfield 1883, Grand 1874, Rio Blanco 1889
Teller 23 Mar 1899 El Paso none
Uncompahgre 18 Jan 1877 Hinsdale, San Juan renamed Ouray 1883
Washington 09 Feb 1887 Weld, Arapahoe Yuma 1889
Weld 01 Nov 1861 Colorado Territory Logan 1887, Morgan 1889, Washington 1887
Yuma 15 Mar 1889 Washington, Arapahoe none

 

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