Lake -- U.S. County in South Dakota Population (2000): 11276 Housing Units (2000): 5282 Land area (2000): 563.228625 sq. miles (1458.755381 sq. km) Water area (2000): 11.827532 sq. miles (30.633165 sq. km) Total area (2000): 575.056157 sq. miles (1489.388546 sq. km) Located within: South Dakota (SD), FIPS 46 Location: 44.019761 N, 97.099990 W Headwords: Lake Lake, SD Lake County Lake County, SD