Douglas County had an estimated population of 357,978 in 2020, making it one of the most populous counties in Colorado. While the largest community is Highlands Ranch, the county seat is Castle Rock.
The county was created in 1861, one of the original 17 counties, and named for Illinois’ U.S. Senator Stephen A. Douglas who died five months prior. It lies halfway between Denver and Colorado Springs. It boasts one of the highest median household incomes among all Colorado counties.
Numerous recreation trails and three state parks fall within Douglas County: Castlewood Canyon, Chatfield, and Roxborough.
Visit the Douglas County Government website.
County Towns
- Aurora (part)
- Castle Pines
- Castle Rock
- Deckers
- Franktown
- Highlands Ranch
- Larkspur
- Littleton
- Lone Tree
- Parker
- Roxborough Park
- Sedalia
Adjacent Counties
Special Events
- Jun-Aug – Colorado Renaissance Festival in Larkspur
- Jul – Castle Rock WineFest
- Sep – Colorado Artfest at Castle Rock
