List of Counties In Colorado State
The state of Colorado has 62 counties in total. Arapahoe County is the oldest (formed in 1861), while Broomfield is the youngest (established in 2001).
El Paso County is the most populous, with a population of 622,263. Las Animas County has the most land area (12,363 km2), and Broomfield has the smallest (87 km2).
Please find a list of all Colorado counties sorted alphabetically below.
- Adams County, CO
- Alamosa County, CO
- Arapahoe County, CO
- Baca County, CO
- Bent County, CO
- Boulder County, CO
- Chaffee County, CO
- Cheyenne County, CO
- Clear Creek County, CO
- Conejos County, CO
- Costilla County, CO
- Crowley County, CO
- Custer County, CO
- Delta County, CO
- Denver County, CO
- Dolores County, CO
- Douglas County, CO
- Eagle County, CO
- El Paso County, CO
- Elbert County, CO
- Fremont County, CO
- Garfield County, CO
- Gilpin County, CO
- Grand County, CO
- Gunnison County, CO
- Hinsdale County, CO
- Huerfano County, CO
- Jackson County, CO
- Jefferson County, CO
- Kiowa County, CO
- Kit Carson County, CO
- La Plata County, CO
- Lake County, CO
- Larimer County, CO
- Las Animas County, CO
- Lincoln County, CO
- Logan County, CO
- Mesa County, CO
- Mineral County, CO
- Moffat County, CO
- Montezuma County, CO
- Montrose County, CO
- Morgan County, CO
- Otero County, CO
- Ouray County, CO
- Park County, CO
- Phillips County, CO
- Pitkins County, CO
- Prowers County, CO
- Pueblo County, CO
- Rio Blanco County, CO
- Rio Grande County, CO
- Routt County, CO
- Saguache County, CO
- San Juan County, CO
- San Miguel County, CO
- Sedgwick County, CO
- Summit County, CO
- Teller County, CO
- Washington County, CO
- Weld County, CO
- Yuma County, CO