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FACT: Genealogy is the STORY of our ancestors, our FAMILY. It is NOT simply a series of names and dates. In order to better uncover the story of our ancestors lives, sometimes it helps to understand the history of what was going on where they lived. It may explain WHY they moved to that place, or why they moved away from it. Knowing the history of our ancestors lives helps to bring their story to life, and provides clues to help us find MORE information about them. Not being historians ourselves, we compile a selection of history, using a variety of online and print sources, such as Encyclopaedia Britannica, Compton's Encyclopedia, and Wikipedia. We hope these historical compiliations are helpful in providing research clues and understanding of how your ancestors lived. |
County | Date Formed | Parent County | County Seat | ||||
Adams | November 15, 1902 | Arapahoe County | Brighton | ||||
Alamosa | March 8, 1913 | Costilla and Conejos Counties | Alamosa | ||||
Arapahoe | November 1, 1861 | Original County | Littleton | ||||
Archuleta | April 14, 1885 | Conejos County | Pagosa Springs | ||||
Baca | April 16, 1889 | Las Animas County | Springfield | ||||
Bent | February 11, 1870 | Huerfano County and tribal lands of Arapajo and Cheyenne | Las Animas | ||||
Boulder | November 1, 1861 | Original County | Boulder | ||||
Broomfield | November 15, 2001 | Boulder, Adams, Jefferson and Weld Counties | Consolidated city and County - Broomfield | ||||
Chaffee | February 10, 1879 | Carbonate County | Salida | ||||
Cheyenne | March 25, 1889 | Elbert and Bent Counties | Cheyenne Wells | ||||
Clear Creek | November 1, 1861 | Original County | Georgetown | ||||
Conejos | November 1, 1861 | Original County | Conejos | ||||
Costilla | November 1, 1861 | Original County | San Luis | ||||
Crowley | May 29, 1911 | Otero County | Ordway | ||||
Custer | March 9, 1877 | Fremont County | Westcliffe | ||||
Delta | February 11, 1883 | Gunnison County | Delta | ||||
Denver | December 1, 1902 | Arapahoe and Adams Counties | Consolidated city and county - Denver | ||||
Dolores | March 4, 1881 | Ouray County | Dove Creek | ||||
Douglas | November 1, 1861 | Original County | Castle Rock | ||||
Eagle | February 11, 1883 | Summit County | Eagle | ||||
El Paso | November 1, 1861 | Original County | Colorado Springs | ||||
Elbert | February 2, 1874 | Douglas County | Kiowa | ||||
Fremont | November 1, 1861 | Original County | Canon City | ||||
Garfield | February 10, 1883 | Summit County/TD> | Glenwood Springs | ||||
Gilpin | November 1, 1861 | Original County | Central City | ||||
Grand | February 2, 1874 | Summit County | Hot Sulphur Springs | ||||
Gunnison | March 9, 1877 | Lake County | Gunnison | ||||
Hinsdale | February 10, 1874 | Lake, Conejos, and Costilla Counties | Lake City | ||||
Huerfano | November 1, 1861 | Original County | Walsenburg | ||||
Jackson | May 5, 1909 | Larimer County | Walden | ||||
Jefferson | November 1, 1861 | Original County | Golden | ||||
Kiowa | April 11, 1889 | Bent County | Eads | ||||
Kit Carson | April 11, 1889 | Elbert County | Burlington | ||||
La Plata | February 10, 1874 | Lake and Conejos Counties | Durango | ||||
Lake | November 1, 1861 | Original County | Leadville | ||||
Larimer | November 1, 1861 | Original County | Fort Collins | ||||
Las Animas | February 9, 1866 | Huerfano County | Trinidad | ||||
Lincoln | April 11, 1889 | Elbert and Bent Counties | Hugo | ||||
Logan | February 25, 1887 | Weld County | Sterling | ||||
Mesa | February 14, 1883 | Gunnison County | Grand Junction | ||||
Minneral | March 27, 1893 | Hinsdale, Rio, Grande, and Saguache Counties | Creede | ||||
Moffat | February 27, 1911 | Routt County | Craig | ||||
Montezuma | April 16, 1889 | La Plata Coumty | Cortez | ||||
Montrose | February 11, 1883 | Gunnison County | Montrose | ||||
Morgan | February 19, 1889 | Weld County | Fort Morgan | ||||
Otero | March 25, 1889 | Bent County | La Junta | ||||
Ouray | January 18, 1877 | Hinsdale and Lake Counties | Ouray | ||||
Park | November 1, 1861 | Original County | Fairplay | ||||
Phillips | March 27, 1889 | Logan County | Holyoke | ||||
Pitkin | February 23, 1881 | Gunnison County | Aspen | ||||
Prowers | April 11, 1889 | Bent County | Lamar | ||||
Pueblo | November 1, 1861 | Original County | Pueblo | ||||
Rio Blanco | March 25, 1889 | Garfield County | Meeker | ||||
Rio Grande | February 10, 1874 | Costilla and Conejos Counties | Del Norte | ||||
Routt | January 29, 1877 | Grande County | Steamboat Springs | ||||
Saguache | December 29, 1866 | Lake and Costilla Counties | Saguache | ||||
San Juan | January 31, 1876 | Lake County | Silverton | ||||
San Miguel | March 2, 1883 | San Juan County | Telluride | ||||
Sedgwick | April 9, 1889 | Logan County | Julesburg | ||||
Summit | November 1, 1861 | Original County | Breckenridge | ||||
Teller | March 23, 1899 | El Paso and Fremont Counties | Cripple Creek | ||||
Washington | March 9, 1887 | Weld County | Akron | ||||
Weld | November 1, 1861 | Original County | Greeley | ||||
Yuma | March 15, 1889 | Washington County | Wray |
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