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

Revision as of 20:31, 5 February 2015

Note
 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

0

  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.
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