The Town of Castle Rock is a home rule municipality that is the county seat and the most populous municipality of Douglas County, Colorado, United States. The town population was 73,158 at the 2020 United States Census, a 51.68% increase since the 2010 United States Census. Castle Rock is the most populous Colorado town (rather than city) and the 16th most populous Colorado municipality. Castle Rock is a part of the Denver-Aurora-Lakewood, CO Metropolitan Statistical Area and the Front Range Urban Corridor.
The town is named for the prominent, castle-shaped butte near the center of town.


Castle Rock was founded in 1874 during the Pikes Peak Gold Rush, and most likely was named for the rock formation. The town of Castleton grew up around it. The gold rush ended soon after a silver boom began nearby in Leadville, and many miners moved there instead. Castle Rock became more quiet over time; however, several events have drawn attention to the area:
The original inhabitants of the area were Native Americans who arrived approximately 8500 years ago (7000 BCE).

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