New Mexico County Creation Dates and Parent Counties: Difference between revisions

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{{Note|See an interactive outline map of [https://digital.newberry.org/ahcb/map/map.html#NM ''New Mexico Historical Counties''] at Newberry Library site.<ref>[https://digital.newberry.org/ahcb/pages/New_Mexico.html ''New Mexico 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.</ref> Select a year and the map will display the historical county boundaries. Click on map image for county details.}}  
{{Note|See an interactive outline map of [http://historical-county.newberry.org/website/Colorado/viewer.htm ''Colorado Historical Counties''] at Newberry Library site<ref>[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.</ref> (Free) Enter a year, '''Refresh Map''', select '''zoom in''', then click on the map to enlarge it.}}  


<br> {{Tip|Sort the table by '''Date Formed''' or by '''Parent Counties''' and check [https://digital.newberry.org/ahcb/documents/NM_County_Index.htm Boundary Changes] for interesting insights.}}  
<br> {{Tip|Sort the table by '''Date Formed''' or by '''Parent Counties''' and check [http://historical-county.newberry.org/website/Colorado/documents/CO_County_Index.htm Boundary Changes] for interesting insights.}}  


{| width="100%" border="1" class="sortable"
{| width="100%" border="1" class="sortable"
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| align="center" style="background: rgb(240, 240, 240) none repeat scroll 0% 0%;" | '''Counties Created by Boundary Changes'''
| align="center" style="background: rgb(240, 240, 240) none repeat scroll 0% 0%;" | '''Counties Created by Boundary Changes'''
|-
|-
| [[Arizona County, New Mexico (Extinct)|Arizona]]  
| [[Alamosa County, Colorado Genealogy|Alamosa]]  
| 1860 Feb 1
| 1913 Mar 08
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#ARIZONA%20(ext) Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#ALAMOSA Details]  
| [[Dona Ana County, New Mexico|Dona Ana]] 
| Costilla, Conejos
| Discontinued 1863
| none
|-
|-
| [[Bernalillo County, New Mexico|Bernalillo]]
| [[Arapahoe County, Colorado Genealogy|Arapahoe]]  
| 1852 Jan 6
| 1861 Nov 01
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#BERNALILLO Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#ARAPAHOE Details]  
| [[New Mexico]] Territory  
| Colorado Territory  
| [[McKinley County, New Mexico|McKinley]] 1899
| Denver 1901, Washington 1887, Yuma 1889
|-
|-
| [[Catron County, New Mexico|Catron]]  
| [[Archuleta County, Colorado Genealogy|Archuleta]]  
| 1921 Feb 25
| 1885 Apr 14
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#CATRON Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#ARCHULETA Details]  
| [[Socorro County, New Mexico|Socorro]]
| Conejos
| none
| none
|-
|-
| [[Chaves County, New Mexico|Chaves]]  
| [[Baca County, Colorado Genealogy|Baca]]  
| 1889 Feb 25
| 1889 Apr 16
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#CHAVES Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#BACA Details]  
| [[Lincoln County, New Mexico|Lincoln]] 
| Los Animas
| [[De Baca County, New Mexico|De Baca]] 1917, [[Lea County, New Mexico|Lea]] 1917, [[Quay County, New Mexico|Quay]] 1903, [[Roosevelt County, New Mexico|Roosevelt]] 1903
| none
|-
|-
| [[Colfax County, New Mexico|Colfax]]  
| [[Boulder County, Colorado Genealogy|Boulder]]  
| 1869 Jan 25
| 1861 Nov 01
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#COLFAX Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#BOULDER Details]  
| [[Mora County, New Mexico|Mora]]
| Colorado Territory
| [[Union County, New Mexico|Union]] 1893
| none
|-
|-
| [[Curry County, New Mexico|Curry]]  
| [[Broomfield County, Colorado Genealogy|City and County of Broomfield]]  
| 1909 Feb 25
| 2001 Nov 15
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#CURRY Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#BROOMFIELD Details]  
| [[Quay County, New Mexico|Quay]], [[Roosevelt County, New Mexico|Roosevelt]]
| nowrap="nowrap" | Adams, Boulder, Jefferson, Weld
| none
| none
|-
|-
| [[De Baca County, New Mexico|De Baca]]  
| Carbonate
| 1917 Feb 28
| 1861 Nov 01
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#DE%20BACA Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm# Details]
| [[Chaves County, New Mexico|Chaves]], [[Guadalupe County, New Mexico|Guadalupe]]  
| Colorado Territory
| renamed Lake 1879
|-
| [[Chaffee County, Colorado Genealogy|Chaffee]]  
| 1879 Feb 10
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#CHAFFEE Details]  
| Lake
| none
|-
| [[Cheyenne County, Colorado Genealogy|Cheyenne]]  
| 1889 Mar 25
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#CHEYENNE Details]
| Bent, Elbert
| Kiowa 1889
|-
| [[Clear Creek County, Colorado Genealogy|Clear Creek]]  
| 1861 Nov 01
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#CLEAR%20CREEK Details]
| Colorado Territory
| none
| none
|-
|-
| [[Dona Ana County, New Mexico|Dona Ana]]  
| [[Conejos County, Colorado Genealogy|Conejos]]  
| 1852 Jan 6
| 1861 Nov 01
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#DO%C3%91A%20ANA Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#CONEJOS Details]  
| [[New Mexico]] Territory  
| Colorado Territory  
| [[Luna County, New Mexico|Luna]] 1901, [[Otero County, New Mexico|Otero]] 1899
| Alamosa 1913, Archuleta 1885, Hinsdale 1874, La Plata 1874, Rio Grande 1874
|-
|-
| [[Eddy County, New Mexico|Eddy]]  
| [[Costilla County, Colorado Genealogy|Costilla]]  
| 1889 Feb 25
| 1861 Nov 01
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#EDDY Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#COSTILLA Details]  
| [[Lincoln County, New Mexico|Lincoln]]
| Colorado Territory
| [[Lea County, New Mexico|Lea]] 1917
| Alamosa 1913, Rio Grande 1874, Saguache 1866
|-
|-
| [[Grant County, New Mexico|Grant]]  
| [[Crowley County, Colorado Genealogy|Crowley]]  
| 1868 Jan 30
| <br> rap no
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#GRANT Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#CROWLEY Details]  
| [[Socorro County, New Mexico|Socorro]]
| Bent, Otero
| [[Hidalgo County, New Mexico|Hidalgo]] 1919, [[Luna County, New Mexico|Luna]] 1901
| none
|-
|-
| [[Guadalupe County, New Mexico|Guadalupe]]  
| [[Custer County, Colorado Genealogy|Custer]]  
| 1891 Feb 26
| 1877 Mar 09
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#GUADALUPE Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#CUSTER Details]  
| [[Lincoln County, New Mexico|Lincoln]], [[San Miguel County, New Mexico|San Miguel]]
| Fremont
| [[De Baca County, New Mexico|De Baca]] 1917
| none
|-
|-
| [[Harding County, New Mexico|Harding]]  
| [[Delta County, Colorado Genealogy|Delta]]  
| 1921 Mar 4
| 1883 Feb 11
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#HARDING Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#DELTA Details]  
| [[Mora County, New Mexico|Mora]], [[Union County, New Mexico|Union]]
| Gunnison
| none
| none
|-
|-
| [[Hidalgo County, New Mexico|Hidalgo]]  
| [[Denver County, Colorado Genealogy|City and County of Denver]]  
| 1919 Feb 25
| 1901 Mar 18
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#HIDALGO Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#DENVER Details]  
| [[Grant County, New Mexico|Grant]]
| Arapahoe
| none
| none
|-
|-
| [[Lea County, New Mexico|Lea]]  
| [[Dolores County, Colorado Genealogy|Dolores]]  
| 1917 Mar 7
| 1881 Feb 19
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#LEA Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#DOLORES Details]  
| [[Chaves County, New Mexico|Chaves]], [[Eddy County, New Mexico|Eddy]]
| Ouray
| none
| none
|-
|-
| [[Lincoln County, New Mexico|Lincoln]]  
| [[Douglas County, Colorado Genealogy|Douglas]]  
| 1869 Jan 16
| 1861 Nov 01
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#LINCOLN Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#DOUGLAS Details]  
| [[Socorro County, New Mexico|Socorro]]  
| Colorado Territory
| [[Chaves County, New Mexico|Chaves]] 1889, [[Eddy County, New Mexico|Eddy]] 1889, [[Otero County, New Mexico|Otero]] 1899, [[Guadalupe County, New Mexico|Guadalupe]] 1891, [[Torrance County, New Mexico|Torrance]] 1903
| Elbert 1874
|-
| [[Eagle County, Colorado Genealogy|Eagle]]  
| 1883 Feb 11
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#EAGLE Details]
| Summit
| none
|-
| [[Elbert County, Colorado Genealogy|Elbert]]  
| 1874 Feb 02
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#ELBERT Details]  
| Douglas
| Kit Carson 1889, Lincoln 1889
|-
| [[El Paso County, Colorado Genealogy|El Paso]]  
| 1861 Nov 01
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#El%20PASO Details]
| Colorado Territory
| Teller 1899
|-
| [[Fremont County, Colorado Genealogy|Fremont]]  
| 1861 Nov 01
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#FREMONT Details]
| Colorado Territory
| Custer 1877
|-
|-
| [[Los Alamos County, New Mexico|Los Alamos]]  
| [[Garfield County, Colorado Genealogy|Garfield]]  
| 1949 Mar 16
| 1883 Feb 10
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#LOS%20ALAMOS Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#GARFIELD Details]  
| [[Sandoval County, New Mexico|Sandoval]], [[Santa Fe County, New Mexico|Santa Fe]]
| Summit
| none
| none
|-
|-
| [[Luna County, New Mexico|Luna]]  
| [[Gilpin County, Colorado Genealogy|Gilpin]]  
| 1901 Mar 16
| 1861 Nov 01
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#LUNA Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#GILPIN Details]  
| [[Dona Ana County, New Mexico|Dona Ana]], [[Grant County, New Mexico|Grant]]
| Colorado Territory
| none
| none
|-
|-
| [[McKinley County, New Mexico|McKinley]]  
| Guadalupe
| 1899 Feb 23
| 1861 Nov 01
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#McKINLEY Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#CONEJOS Details]
| [[Bernalillo County, New Mexico|Bernalillo]], [[Valencia County, New Mexico|Valencia]], [[San Juan County, New Mexico|San Juan]], [[Rio Arriba County, New Mexico|Rio Arriba]] 
| Colorado Territory
| renamed Conejos 1861
|-
| [[Gunnison County, Colorado Genealogy|Gunnison]]  
| 1877 Mar 09
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#GUNNISON Details]  
| Lake
| Delta 1883, Mesa 1883, Montrose 1883, Pitkin 1881
|-
| [[Hinsdale County, Colorado Genealogy|Hinsdale]]  
| 1874 Feb 10
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#HINSDALE Details]  
| Conejos
| Mineral 1893, Ouray 1877, Uncompahgre 1877
|-
| [[Huerfano County, Colorado Genealogy|Huerfano]]  
| 1861 Nov 01
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#HUERFANO Details]  
| Colorado Territory
| Los Animas 1866
|-
| [[Jackson County, Colorado Genealogy|Jackson]]  
| <br> May 05
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#JACKSON Details]
| Grand, Larimer
| none
| none
|-
|-
| [[Mora County, New Mexico|Mora]]  
| [[Jefferson County, Colorado Genealogy|Jefferson]]  
| 1860 Feb 1
| 1861 Nov 01
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#MORA Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#JEFFERSON Details]  
| [[San Miguel County, New Mexico|San Miguel]]  
| Colorado Territory
| [[Colfax County, New Mexico|Colfax]] 1869, [[Harding County, New Mexico|Harding]] 1921, [[Union County, New Mexico|Union]] 1893
| none
|-
| [[Kiowa County, Colorado Genealogy|Kiowa]]  
| 1889 Apr 11
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#KIOWA Details]  
| Cheyenne, Bent
| none
|-
|-
| [[Otero County, New Mexico|Otero]]  
| [[Kit Carson County, Colorado Genealogy|Kit Carson]]  
| 1899 Jan 30
| 1889 Apr 11
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#OTERO Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#KIT%20CARSON Details]  
| [[Dona Ana County, New Mexico|Dona Ana]], [[Lincoln County, New Mexico|Lincoln]], [[Socorro County, New Mexico|Socorro]]
| Elbert
| none
| none
|-
|-
| [[Quay County, New Mexico|Quay]]  
| [[Lake County, Colorado Genealogy|Lake]]  
| 1903 Feb 28
| 1879 Feb 10
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#QUAY Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#LAKE Details]  
| [[Chaves County, New Mexico|Chaves]]
| renamed from Carbonate
| [[Curry County, New Mexico|Curry]] 1909
| Chaffee 1879, Gunnison 1877
|-
|-
| [[Rio Arriba County, New Mexico|Rio Arriba]]  
| [[La Plata County, Colorado Genealogy|La Plata]]  
| 1852 Jan 6
| 1874 Feb 10
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#RIO%20ARRIBA Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#LA%20PLATA Details]  
| [[New Mexico]] Territory 
| Conejos, Lake
| [[Sandoval County, New Mexico|Sandoval]] 1903, [[San Juan County, New Mexico|San Juan]] 1887
| Montezuma 1889, San Juan 1876
|-
|-
| [[Roosevelt County, New Mexico|Roosevelt]]  
| [[Larimer County, Colorado Genealogy|Larimer]]  
| 1903 Feb 28
| 1861 Nov 01
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#ROOSEVELT Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#LARIMER Details]  
| [[Chaves County, New Mexico|Chaves]] 
| Colorado Territory
| [[Curry County, New Mexico|Curry]] 1909
| Jackson 1909
|-
|-
| [[Sandoval County, New Mexico|Sandoval]]  
| [[Las Animas County, Colorado Genealogy|Las Animas]]  
| 1903 Mar 10
| 1866 Nov 09
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#SANDOVAL Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#LAS%20ANIMAS Details]  
| [[Rio Arriba County, New Mexico|Rio Arriba]]
| Huerfano
| [[Los Alamos County, New Mexico|Los Alamos]] 1949
| Baca 1889
|-
|-
| [[San Juan County, New Mexico|San Juan]]
| [[Lincoln County, Colorado Genealogy|Lincoln]]  
| 1877 Feb 24
| 1889 Apr 11
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#SAN%20JUAN Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#LINCOLN Details]  
| [[Rio Arriba County, New Mexico|Rio Arriba]]
| Elbert
| [[McKinley County, New Mexico|McKinley]] 1899
| none
|-
|-
| [[San Miguel County, New Mexico|San Miguel]]  
| [[Logan County, Colorado Genealogy|Logan]]  
| 1852 Jan 6
| 1887 Feb 02
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#SAN%20MIGUEL Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#LOGAN Details]  
| [[New Mexico]] Territory
| Weld
| [[Guadalupe County, New Mexico|Guadalupe]] 1891,  [[Mora County, New Mexico|Mora]] 1860, [[Torrance County, New Mexico|Torrance]] 1903, [[Union County, New Mexico|Union]] 1893
| Phillips 1889, Sedgwick 1889
|-
|-
| [[Santa Ana Pueblo (New Mexico)|Santa Ana]]
| [[Mesa County, Colorado Genealogy|Mesa]]  
| 1852 Jan 6
| 1883 Feb 14
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#SANTA%20ANA%20(ext) Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#MESA Details]  
| [[New Mexico]] Territory
| Gunnison
| Discontinued 1876
| none
|-
|-
| [[Santa Fe County, New Mexico|Santa Fe]]  
| [[Mineral County, Colorado Genealogy|Mineral]]  
| 1852 Jan 6
| 1893 Mar 27
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#SANTA%20FE Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#MINERAL Details]  
| [[New Mexico]] Territory
| Hinsdale
| [[Los Alamos County, New Mexico|Los Alamos]] 1949, [[Torrance County, New Mexico|Torrance]] 1903
| none
|-
|-
| [[Sierra County, New Mexico|Sierra]]  
| [[Moffat County, Colorado Genealogy|Moffat]]  
| 1884 Apr 3
| 1911 Feb 27
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#SIERRA Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#MOFFAT Details]  
| [[Socorro County, New Mexico|Socorro]]
| Routt
| none
| none
|-
|-
| [[Socorro County, New Mexico|Socorro]]  
| [[Montezuma County, Colorado Genealogy|Montezuma]]  
| 1852 Jan 6
| 1889 Apr 16
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#SOCORRO Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#MONTEZUMA Details]  
| [[New Mexico]] Territory 
| La Plata
| [[Sierra County, New Mexico|Sierra]] 1884, [[Torrance County, New Mexico|Torrance]] 1903, [[Catron County, New Mexico|Catron]] 1921, [[Grant County, New Mexico|Grant]] 1868, [[Lincoln County, New Mexico|Lincoln]] 1869, [[Otero County, New Mexico|Otero]] 1899
| none
|-
|-
| [[Taos County, New Mexico|Taos]]  
| [[Montrose County, Colorado Genealogy|Montrose]]  
| 1852 Jan 6
| 1883 Feb 11
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#TAOS Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#MONTROSE Details]  
| [[New Mexico]] Territory
| Gunnison
| none
| none
|-
|-
| [[Torrance County, New Mexico|Torrance]]  
| [[Morgan County, Colorado Genealogy|Morgan]]  
| 1903 Mar 16
| 889 Feb 19
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#TORRANCE Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#MORGAN Details]  
| [[Lincoln County, New Mexico|Lincoln]], [[San Miguel County, New Mexico|San Miguel]], [[Santa Fe County, New Mexico|Santa Fe]], [[Valencia County, New Mexico|Valencia]], [[Socorro County, New Mexico|Socorro]]
| Weld
| none
| none
|-
|-
| [[Union County, New Mexico|Union]]  
| [[Otero County, Colorado Genealogy|Otero]]  
| 1893 Feb 23
| 1889 Feb 19
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#UNION Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#OTERO Details]  
| [[Colfax County, New Mexico|Colfax]], [[Mora County, New Mexico|Mora]], [[San Miguel County, New Mexico|San Miguel]]
| Bent
| [[Harding County, New Mexico|Harding]] 1921
| Crowley 1911
|-
|-
| [[Valencia County, New Mexico|Valencia]]  
| [[Ouray County, Colorado Genealogy|Ouray]]  
| 1852 Jan 6
| 1883 Mar 02
| [https://digital.newberry.org/ahcb/documents/NM_Individual_County_Chronologies.htm#VALENCIA Details]  
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#OURAY Details]
| [[New Mexico]] Territory  
| nowrap="nowrap" | renamed from Uncompahgre
| [[McKinley County, New Mexico|McKinley]] 1899, [[Torrance County, New Mexico|Torrance]] 1903
| Dolores 1881, San Miguel 1861
|-
| [[Park County, Colorado Genealogy|Park]]
| 1861 Nov 01
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#PARK Details]
| Colorado Territory
| none
|-
| [[Phillips County, Colorado Genealogy|Phillips]]
| 1889 Mar 27
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#PHILLIPS Details]
| Logan
| none
|-
| [[Pitkin County, Colorado Genealogy|Pitkin]]
| 1881 Feb 23
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#PITKIN Details]
| Gunnison
| none
|-
| [[Prowers County, Colorado Genealogy|Prowers]]
| 1889 Apr 11
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#PROWERS Details]
| Bent
| none
|-
| [[Pueblo County, Colorado Genealogy|Pueblo]]
| 1861 Nov 01
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#PUEBLO Details]
| Colorado Territory
| none
|-
| [[Rio Blanco County, Colorado Genealogy|Rio Blanco]]
| 1889 Mar 25
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#RIO%20BLANCO Details]
| Summit
| none
|-
| [[Rio Grande County, Colorado Genealogy|Rio Grande]] (del Norte)
| 1874 Feb 10
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#RIO%20GRANDE Details]
| Conejos, Costilla
| none
|-
| [[Routt County, Colorado Genealogy|Routt]]
| 1877 Jan 29
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#ROUTT Details]
| Grand
| Moffatt 1911
|-
| [[Saguache County, Colorado Genealogy|Saguache]]
| 1866 Dec 29
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#SAGUACHE Details]
| Costilla
| none
|-
| [[San Juan County, Colorado Genealogy|San Juan]]
| 1876 Jan 31
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#SAN%20JUAN Details]
| La Plata
| Uncompahgre 1877
|-
| [[San Miguel County, Colorado Genealogy|San Miguel]]
| 1861 Nov 01
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#SAN%20MIGUEL Details]
| Colorado Territory
| none
|-
| [[Sedgwick County, Colorado Genealogy|Sedgwick]]
| 1889 Apr 09
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#SEDGWICK Details]  
| Logan
| none
|-
| [[Summit County, Colorado Genealogy|Summit]]  
| 1861 Nov 01
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#SUMMIT Details]
| Colorado Territory  
| Eagle 1883, Garfield 1883, Grand 1874, Rio Blanco 1889
|-
| [[Teller County, Colorado Genealogy|Teller]]  
| 1899 Mar 23
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#TELLER Details]
| El Paso
| none
|-
| [[Uncompahgre County, Colorado Genealogy|Uncompahgre]]
| 1877 Jan 18
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#UNCOMPAHGRE Details]
| Hinsdale, San Juan
| renamed Ouray 1883
|-
| [[Washington County, Colorado Genealogy|Washington]]  
| 1887 Feb 09
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#WASHINGTON Details]
| Weld, Arapahoe
| Yuma 1889
|-
| [[Weld County, Colorado Genealogy|Weld]]
| 1861 Nov 01
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#WELD Details]
| Colorado Territory
| Logan 1887, Morgan 1889, Washington 1887
|-
| [[Yuma County, Colorado Genealogy|Yuma]]
| 1889 Mar 15
| [http://publications.newberry.org/ahcbp/documents/CO_Individual_County_Chronologies.htm#YUMA Details]
| Washington, Arapahoe
| none
|}
|}
==References==
==References==
{{Reflist}}
{{Reflist}}
[[Category:United_States_County_Creations]]
[[Category:United_States_County_Creations]]

Revision as of 16:52, 5 June 2015


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]

  1. [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.