McCook -- U.S. County in South Dakota Population (2000): 5832 Housing Units (2000): 2383 Land area (2000): 574.515451 sq. miles (1487.988123 sq. km) Water area (2000): 2.639899 sq. miles (6.837306 sq. km) Total area (2000): 577.155350 sq. miles (1494.825429 sq. km) Located within: South Dakota (SD), FIPS 46 Location: 43.662682 N, 97.378786 W Headwords: McCook McCook, SD McCook County McCook County, SD