The Town of Castle Rock is the county seat of Douglas County, Colorado, United States and is named after the prominent, castle tower-shaped butte near the center of town. It is part of Colorado's Front Range Urban Corridor and is located roughly 28 miles (45 km) south of downtown Denver and 37 mi (60 km) north of Colorado Springs. As of the 2010 census, the town had a population of 48,231.