Portsmouth, IA -- U.S. city in Iowa Population (2000): 225 Housing Units (2000): 103 Land area (2000): 0.273238 sq. miles (0.707683 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.273238 sq. miles (0.707683 sq. km) FIPS code: 64200 Located within: Iowa (IA), FIPS 19 Location: 41.650730 N, 95.519669 W ZIP Codes (1990): 51565 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Portsmouth, IA Portsmouth