Long Lake, SD -- U.S. town in South Dakota Population (2000): 58 Housing Units (2000): 44 Land area (2000): 0.276224 sq. miles (0.715418 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.276224 sq. miles (0.715418 sq. km) FIPS code: 38860 Located within: South Dakota (SD), FIPS 46 Location: 45.856258 N, 99.206571 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Long Lake, SD Long Lake