[County Line Station in Lone Tree. Photo: Jeffrey Beall] Douglas County had an estimated population of 305,963 in 2013, making it the eighth-most populous county 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 the highest median household income among all Colorado counties and is ranked 8th in the nation. In 2009, Money magazine ranked Douglas County 5th in the United States for “Job Growth Over the Last Eight Years.”
Numerous recreation trails and three state parks fall within Douglas County: Castlewood Canyon, Chatfield, and Roxborough.
Visit the Douglas County Government website.
Douglas County map.
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
Douglas County Courthouse in Castle Rock. Photo: Jimmy Emerson, DVM
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