Adams Created:   1901 Parent:   Arapahoe	Alamosa Created:   1913 Parent:   Costillo, Conejos	Arapahoe Created:   1861 Parent:   Original county	Archuleta Created:   1885 Parent:   Conejos	Baca Created:   1889 Parent:   Las Animas	Bent Created:   1874 Parent:   Greenwood
Boulder Created:   1861 Parent:   Original county	Broomfield Created:   Nov. 15 2001 Parent:   Colorado's newest County! from parts of Adams, Boulder, Jefferson, Weld	Chaffee Created:   1879 Parent:   Lake	Cheyenne Created:   1889 Parent:   Bent, Elbert	Clear Creek Created:   1861 Parent:   Original county	Conejos ( formerly Guadalupe) Created:   1861 Parent:   Original county
Costilla Created:   1861 Parent:   Original county	Crowley Created:   1911 Parent:   Bent, Otero	Custer Created:   1877 Parent:   Fremont	Delta Created:   1883 Parent:   Gunnison	Denver ( City & Co. of ) Created:   1901 Parent:   Arapahoe	Dolores Created:   1881 Parent:   Ouray
Douglas Created:   1861 Parent:   Original county	Eagle Created:   1883 Parent:   Summit	Elbert Created:   1874 Parent:   Douglas, Greenwood	El Paso Created:   1861 Parent:   Original county	Fremont Created:   1859 Parent:   Original county	Garfield Created:   1883 Parent:   Summit
Greenwood Created:   1870 Parent:   Dissolved 1874	Gilpin Created:   1861 Parent:   Original county	Grand Created:   1874 Parent:   Summit	Gunnison Created:   1877 Parent:   Lake	Hinsdale Created:   1874 Parent:   Conejos	Huerfano Created:   1861 Parent:   Original county
Jackson Created:   1909 Parent:   Grand, Larimer	Jefferson Created:   1861 Parent:   Original county	Kiowa Created:   1889 Parent:   Cheyenne, Bent	Kit Carson Created:   1889 Parent:   Elbert	Lake ( formerly Carbonate) Created:   1861 Parent:   Original county	La Plata Created:   1874 Parent:   Conejos, Lake
Larimer Created:   1861 Parent:   Original county	Las Animas Created:   1866 Parent:   Huerfano	Lincoln Created:   1889 Parent:   Elbert	Logan Created:   1887 Parent:   Weld	Mesa Created:   1883 Parent:   Gunnison	Mineral Created:   1892 Parent:   Hinsdale
Moffat Created:   1911 Parent:   Routt	Montezuma Created:   1889 Parent:   La Plata	Montrose Created:   1883 Parent:   Gunnison	Morgan Created:   1889 Parent:   Weld	Otero Created:   1889 Parent:   Bent	Ouray ( formerly Uncompahgre) Created:   1877 Parent:   Hinsdale, San Juan
Park Created:   1861 Parent:   Original county	Phillips Created:   1889 Parent:   Logan	Pitkin Created:   1881 Parent:   Gunnison	Platte Created:   1872 Parent:   Weld	Prowers Created:   1889 Parent:   Bent	Pueblo Created:   1861 Parent:   Original county
Rio Blanco Created:   1889 Parent:   Summit	Rio Grande Created:   1874 Parent:   Conejos, Costilla	Routt Created:   1877 Parent:   Grand	Saguache Created:   1866 Parent:   Rio Grande	San Juan Created:   1876 Parent:   La Plata	San Miguel Created:   1883 Parent:   Ouray
Sedgwick Created:   1889 Parent:   Logan	Summit Created:   1861 Parent:   Original county	Teller Created:   1899 Parent:   El Paso	Washington Created:   1887 Parent:   Weld, Arapahoe	Weld Created:   1861 Parent:   Original county	Yuma Created:   1889 Parent:   Washington, Arapahoe