Latitude / Longitude:
45° 51′ 19″ N, 97° 1′ 16″ W
Central (CST) (UTC-6)
Hammer is an unincorporated community in Roberts County, in the U.S. state of South Dakota.
A post office called Hammer was established in 1915, and remained in operation until 1973. The community was named after Gunder and Ivor Hammer, the original owners of the town site.