New Mexico County Creation Dates and Parent Counties
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See an interactive outline map of Colorado Historical Counties at Newberry Library site[1] (Free) Enter a year, Refresh Map, select zoom in, then click on the map to enlarge it. |
| 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 |
| 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 | Los Animas | none |
| 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 | rap no |
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 | 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 |
| Guadalupe | 1861 Nov 01 | Details | Colorado Territory | renamed Conejos 1861 |
| 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 | 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 | 889 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[edit | edit source]
- ↑ [http://historical-county.newberry.org/website/Colorado/viewer.htm 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.