Walworth -- U.S. County in South Dakota Population (2000): 5974 Housing Units (2000): 3144 Land area (2000): 707.812814 sq. miles (1833.226695 sq. km) Water area (2000): 36.405820 sq. miles (94.290637 sq. km) Total area (2000): 744.218634 sq. miles (1927.517332 sq. km) Located within: South Dakota (SD), FIPS 46 Location: 45.471130 N, 100.138574 W Headwords: Walworth Walworth, SD Walworth County Walworth County, SD