Castle Rock founded
1874 CE.
Shown on the map at 39.372°, -104.856°.
Castle Rock is a home rule town that is the county seat of and the most-populous municipality in Douglas County, Colorado, United States. The town's population was 73,158 at the 2020 census, a 51.68% increase since the 2010 census. Castle Rock is the most-populous Colorado town (rather than city) and the 14th-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.
Text from the Wikipedia article Castle Rock, Colorado, licensed CC BY-SA 4.0.