Extinct Colorado Counties:: (not linked unless noted, ): (If you know of more to be added, please contact us.)
County Name
Arapahoe County
Guadalupe -
Oro -
Platte -
South Arapahoe -
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Factual information
Kansas Territory, (08-25-1855 to 01-29-1861) was created but never organized. Reverted to unorganized territory when Kansas joined the Union.
Colorado Territory, (11-01-1861 to 11-07-1861) was one of the 17 original counties created by the Territory of Colorado. The county was renamed Conejos County after only six days.
(02-07-1859 to 01-29-1861) was split from Arapahoe County, but never organized. Reverted to unorganized territory when Kansas joined the Union.
Colorado Territory, (02-09-1872 to 02-09-1874) was created from the eastern portion of Weld County. The county was abolished two years later after organizers failed to secure voter approval, and the territory of the county was returned to Weld County.
(11-15-1902 to 04-11-1903) was one of three counties created from Arapahoe County in 1902. The name was changed back to Arapahoe County after five months.
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Genealogical/Historical Commissions, Societies and Museums: Please click on graphic below, " " (if present) for the entire GHLL county "package"
(To list a local society, please contact us.)
County Name
A ——
Adams -
Adams -
Arapahoe -
Archuleta -
B ——
Baca -
Bolder -
Bolder -
C ——
Chaffee -
Chaffee -
E ——
El Paso -
G ——
Gilpin -
L ——
Larimer -
Larimer -
O ——
Otero -
Otero -
Ouray -
P ——
Park -
Phillips -
Pueblo -
R ——
Rio Blanco -
S ——
San Juan -
San Miguel -
Sedgwick -
Summit -
T ——
Teller -
Teller -
W ——
Weld -
Weld -
V ——
Yuma -
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Society Name and Location
Adams County Historical Society (Brighton, CO) 
Brighton Genealogy Society (Brighton, CO) 
Sheridan Historical Society (Sheridan, CO) 
Archuleta County Historical Society and Museum (Pagosa Springs, CO) 
Baca County Historical Society (Springfield, CO) 
Boulder Genealogical Society (Boulder, CO) 
Niwot Historical Society (Niwot, CO) 
Chaffee County Genealogical Society (Buena Vista Heritage Museum) (Buena Vista, CO) 
Heritage Museum and Depot Museum (Buena Vista, CO) 
Old Colorado City Historical Society & Museum (Colorado Springs, CO) 
Gilpin Historical Society (Central City, CO) 
Larimer County Genealogical Society (Fort Collins, CO) 
Berthoud Historical Society (Berthoud, CO) 
Koshare Indian Museum (La Junta, CO) 
Otero Museum (La Junta, CO) 
Ouray County Historical Society & Museum (Ouray, CO) 
South Park City Museum (Fairplay, CO) 
Phillips County Historical Society & Museum (Holyoke, CO) 
Pueblo County Historical Society (Pueblo, CO) 
Rio Blanco County Historical Society (Pueblo, CO) 
San Juan County Historical Society (Silverton, CO) 
Telluride Historical Museum (Telluride, CO) 
Sedgwick County Genealogical Society (Julesburg, CO) 
Summit County Historical Society (Breckenridge, CO) 
Pikes Peak Historical Society and Museum (Florissant, CO) 
Ute Pass Historical Society (Woodland Park, CO) 
Johnstown Historical Society & Museum (Johnstown, CO) 
Weld County Genealogical Society (Greeley, CO) 
Yuma Area Genealogical Society (Yuma, CO) 
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