Groton, SD -- U.S. city in South Dakota Population (2000): 1356 Housing Units (2000): 581 Land area (2000): 1.702474 sq. miles (4.409388 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.702474 sq. miles (4.409388 sq. km) FIPS code: 26340 Located within: South Dakota (SD), FIPS 46 Location: 45.451015 N, 98.099050 W ZIP Codes (1990): 57445 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Groton, SD Groton