De Smet, SD -- U.S. city in South Dakota Population (2000): 1164 Housing Units (2000): 582 Land area (2000): 1.056117 sq. miles (2.735330 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.056117 sq. miles (2.735330 sq. km) FIPS code: 16260 Located within: South Dakota (SD), FIPS 46 Location: 44.385871 N, 97.551703 W ZIP Codes (1990): 57231 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: De Smet, SD De Smet