Frankfort, SD -- U.S. city in South Dakota Population (2000): 166 Housing Units (2000): 99 Land area (2000): 0.774275 sq. miles (2.005362 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.774275 sq. miles (2.005362 sq. km) FIPS code: 22580 Located within: South Dakota (SD), FIPS 46 Location: 44.877368 N, 98.306068 W ZIP Codes (1990): 57440 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Frankfort, SD Frankfort