Castle Rock, South Dakota
Castle Rock is an unincorporated community in Butte County, in the U.S. state of South Dakota.
A post office called Castle Rock was established in 1910, and remained in operation until 1972. The community took its name from Castle Rock Butte.
Coordinates: 44°57′52″N 103°25′28″W / 44.96444°N 103.42444°W
...
Wikipedia