Ipswich, SD -- U.S. city in South Dakota Population (2000): 943 Housing Units (2000): 440 Land area (2000): 1.311053 sq. miles (3.395611 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.311053 sq. miles (3.395611 sq. km) FIPS code: 31860 Located within: South Dakota (SD), FIPS 46 Location: 45.445009 N, 99.030239 W ZIP Codes (1990): 57451 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Ipswich, SD Ipswich