Colorado - County Formations

County Year Organized Parent County County Seat
Adams1901ArapahoeBrighton
Alamosa1913Conejos, CostilloAlamosa
Arapahoe1861Original CountyLittleton
Archuleta1885ConejosPagosa Springs
Baca1889Las AnimasSpringfield
Bent1874GreenwoodLas Animas
Boulder1861Original CountyBoulder
BroomfieldNov. 15, 2001Adams, Boulder, Jefferson and WeldBroomfield
Chaffee1879LakeSalida
Cheyenne1889Bent and ElbertCheyenne Wells
Clear Creek1861Original CountyGeorgetown
Conejos1861Original CountyConejos - formerly Guadalupe (1861-1875)
Costilla1861Original CountySan Luis
Crowley1911Bent and OteroOrdway
Custer1877FremontWestcliffe
Delta1883GunnisonDelta
Denver1901ArapahoeDenver
Dolores1881OurayDove Creek
Douglas1861Original CountyCastle Rock
Eagle1883SummitEagle
Elbert1874Douglas and GreenwoodKiowa
El Paso1861Original CountyColorado Springs
Fremont1859Original CountyCanon City
Garfield1883SummitGlenwood Springs
Greenwood1870Created from land previously reserved for the Arapahoe
and Cheyenne Indian tribes.		 Dissolved 1874 - The land was divided between Bent and Elbert Counties.
Gilpin1861Original CountyCentral City
Grand1874SummitHot Sulphur Springs
Gunnison1877LakeGunnison
Hinsdale1874ConejosLake City
Huerfano1861Original CountyWalsenburg
Jackson1909Grand and LarimerWalden
Jefferson1861Original CountyGolden
Kiowa1889Bent and CheyenneEads
Kit Carson1889ElbertBurlington
Lake1861Original County
briefly renamed Carbonate Co. in 1879,
which existed for only two days (Feb 8 - Feb 10, 1879)		Leadville
La Plata1874Conejos and LakeDurango
Larimer1861Original CountyFort Collins
Las Animas1866HuerfanoTrinidad
Lincoln1889ElbertHugo
Logan1887WeldSterling
Mesa1883GunnisonGrand Junction
Mineral1892HinsdaleCreede
Moffat1911RouttCraig
Montezuma1889La PlataCortez
Montrose1883GunnisonMontrose
Morgan1889WeldFort Morgan
Otero1889BentLa Junta
Ouray1877Hinsdale and San Juan,
briefly renamed Uncompahgre Co. in 1883, which existed
for only three days (Feb 27 - Mar 2, 1883) in the 1883 reorganization of Ouray and San Juan counties that created San Miguel County.		Ouray
Park1861Original CountyFairplay
Phillips1889LoganHolyoke
Pitkin1881GunnisonAspen
Platte1872Weld1874 dissolved
Reverted back to Weld County
Prowers1889BentLamar
Pueblo1861Original CountyPueblo
Rio Blanco1889SummitMeeker
Rio Grande1874Conejos and CostillaDel Norte
Routt1877GrandSteamboat Springs
Saguache1866Rio GrandeSaguache
San Juan1876La PlataSilverton
San Miguel1883OurayTelluride
Sedgwick1889LoganJulesburg
Summit1861Original CountyBreckenridge
Teller1899El PasoCripple Creek
Washington1887Arapahoe and WeldAkron
Weld1861Original CountyGreeley
Yuma1889Arapahoe and WashingtonWray



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