Grant -- U.S. County in South Dakota Population (2000): 7847 Housing Units (2000): 3456 Land area (2000): 682.513339 sq. miles (1767.701357 sq. km) Water area (2000): 5.400626 sq. miles (13.987556 sq. km) Total area (2000): 687.913965 sq. miles (1781.688913 sq. km) Located within: South Dakota (SD), FIPS 46 Location: 45.187196 N, 96.711868 W Headwords: Grant Grant, SD Grant County Grant County, SD