Roberts -- U.S. County in South Dakota Population (2000): 10016 Housing Units (2000): 4734 Land area (2000): 1101.277345 sq. miles (2852.295107 sq. km) Water area (2000): 34.077095 sq. miles (88.259266 sq. km) Total area (2000): 1135.354440 sq. miles (2940.554373 sq. km) Located within: South Dakota (SD), FIPS 46 Location: 45.623515 N, 96.947921 W Headwords: Roberts Roberts, SD Roberts County Roberts County, SD