Latitude / Longitude:
44° 57′ 52″ N, 103° 25′ 28″ W
Central (CST) (UTC-6)
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.