Houghton, IA -- U.S. city in Iowa Population (2000): 130 Housing Units (2000): 61 Land area (2000): 0.301528 sq. miles (0.780954 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.301528 sq. miles (0.780954 sq. km) FIPS code: 37335 Located within: Iowa (IA), FIPS 19 Location: 40.783009 N, 91.612605 W ZIP Codes (1990): 52631 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Houghton, IA Houghton