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Colorado County Creation Dates and Parent Counties

Note
 See an interactive outline map of Colorado Historical Counties at Newberry Library site.[1] Select a year and the map will display the historical county boundaries. Click on map image for county details.


Tip: Sort the table by Date Formed or by Parent Counties and check Boundary Changes for interesting insights.
Name of County Date Formed Boundary
Changes 		Parent County Counties Created by Boundary Changes
Adams 1902 Nov 15 Details Arapahoe Broomfield 2001
Alamosa 1913 Mar 08 Details Costilla, Conejos none
Arapahoe 1861 Nov 01 Details Colorado Territory Denver 1901, Washington 1887, Yuma 1889
Archuleta 1885 Apr 14 Details Conejos none
Baca 1889 Apr 16 Details Las Animas none
Bent 1870 Feb 11 Details Las Animas, Pueblo Cheyenne 1889, Otero 1889, Kiowa 1889, Lincoln 1889, Prowers 1889
Boulder 1861 Nov 01 Details Colorado Territory none
City and County of Broomfield 2001 Nov 15 Details Adams, Boulder, Jefferson, Weld none
Carbonate 1861 Nov 01 Details Colorado Territory renamed Lake 1879
Chaffee 1879 Feb 10 Details Lake none
Cheyenne 1889 Mar 25 Details Bent, Elbert Kiowa 1889
Clear Creek 1861 Nov 01 Details Colorado Territory none
Conejos 1861 Nov 01 Details Colorado Territory Alamosa 1913, Archuleta 1885, Hinsdale 1874, La Plata 1874, Rio Grande 1874
Costilla 1861 Nov 01 Details Colorado Territory Alamosa 1913, Rio Grande 1874, Saguache 1866
Crowley 1911 May 29 Details Bent, Otero none
Custer 1877 Mar 09 Details Fremont none
Delta 1883 Feb 11 Details Gunnison none
City and County of Denver 1901 Mar 18 Details Arapahoe none
Dolores 1881 Feb 19 Details Ouray none
Douglas 1861 Nov 01 Details Colorado Territory Elbert 1874
Eagle 1883 Feb 11 Details Summit none
Elbert 1874 Feb 02 Details Douglas Kit Carson 1889, Lincoln 1889
El Paso 1861 Nov 01 PASO Details Colorado Territory Teller 1899
Fremont 1861 Nov 01 Details Colorado Territory Custer 1877
Garfield 1883 Feb 10 Details Summit none
Gilpin 1861 Nov 01 Details Colorado Territory none
Grand 1874 Feb 02 Details Summit Routt 1877
Greenwood 1870 Feb 11 Details Pueblo Elbert 1874, Bent 1874, Became extinct in 1874
Guadalupe 1861 Nov 01 Colorado Territory Details renamed Conejos 1861 none
Gunnison 1877 Mar 09 Details Lake Delta 1883, Mesa 1883, Montrose 1883, Pitkin 1881
Hinsdale 1874 Feb 10 Details Conejos Mineral 1893, Ouray 1877, Uncompahgre 1877
Huerfano 1861 Nov 01 Details Colorado Territory Los Animas 1866
Jackson 1909 May 05 Details Grand, Larimer none
Jefferson 1861 Nov 01 Details Colorado Territory none
Kiowa 1889 Apr 11 Details Cheyenne, Bent none
Kit Carson 1889 Apr 11 Details Elbert none
Lake 1879 Feb 10 Details renamed from Carbonate Chaffee 1879, Gunnison 1877
La Plata 1874 Feb 10 Details Conejos, Lake Montezuma 1889, San Juan 1876
Larimer 1861 Nov 01 Details Colorado Territory Jackson 1909
Las Animas 1866 Nov 09 Details Huerfano Baca 1889
Lincoln 1889 Apr 11 Details Elbert none
Logan 1887 Feb 02 Details Weld Phillips 1889, Sedgwick 1889
Mesa 1883 Feb 14 Details Gunnison none
Mineral 1893 Mar 27 Details Hinsdale none
Moffat 1911 Feb 27 Details Routt none
Montezuma 1889 Apr 16 Details La Plata none
Montrose 1883 Feb 11 Details Gunnison none
Morgan 1889 Feb 19 Details Weld none
Otero 1889 Feb 19 Details Bent Crowley 1911
Ouray 1883 Mar 02 Details renamed from Uncompahgre Dolores 1881, San Miguel 1861
Park 1861 Nov 01 Details Colorado Territory none
Phillips 1889 Mar 27 Details Logan none
Pitkin 1881 Feb 23 Details Gunnison none
Prowers 1889 Apr 11 Details Bent none
Pueblo 1861 Nov 01 Details Colorado Territory none
Rio Blanco 1889 Mar 25 Details Summit none
Rio Grande (del Norte) 1874 Feb 10 Details Conejos, Costilla none
Routt 1877 Jan 29 Details Grand Moffatt 1911
Saguache 1866 Dec 29 Details Costilla none
San Juan 1876 Jan 31 Details La Plata Uncompahgre 1877
San Miguel 1861 Nov 01 Details Colorado Territory none
Sedgwick 1889 Apr 09 Details Logan none
Summit 1861 Nov 01 Details Colorado Territory Eagle 1883, Garfield 1883, Grand 1874, Rio Blanco 1889
Teller 1899 Mar 23 Details El Paso none
Uncompahgre 1877 Jan 18 Details Hinsdale, San Juan renamed Ouray 1883
Washington 1887 Feb 09 Details Weld, Arapahoe Yuma 1889
Weld 1861 Nov 01 Details Colorado Territory Logan 1887, Morgan 1889, Washington 1887
Yuma 1889 Mar 15 Details Washington, Arapahoe none

References

  1. ↑ Colorado Atlas of Historical County Boundaries, John H. Long, Editor; Peggy Tuck Sinko, Associate Editor; Gordon DenBoer, Historical Compiler; Douglas Knox, Book Digitizing Director and Digital Compiler; Emily Kelley, Research Associate; Laura Rico-Beck, GIS Specialist; Peter Siczewicz, ArcIMS Interactive Map Designer; Robert Will, Cartographic Assistant. Copyright The Newberry Library 2008.
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