Allison, IA -- U.S. city in Iowa Population (2000): 1006 Housing Units (2000): 454 Land area (2000): 2.948636 sq. miles (7.636933 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 2.948636 sq. miles (7.636933 sq. km) FIPS code: 01315 Located within: Iowa (IA), FIPS 19 Location: 42.753466 N, 92.794599 W ZIP Codes (1990): 50602 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Allison, IA Allison