Allendale, MO -- U.S. town in Missouri Population (2000): 54 Housing Units (2000): 35 Land area (2000): 0.567736 sq. miles (1.470430 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.567736 sq. miles (1.470430 sq. km) FIPS code: 00712 Located within: Missouri (MO), FIPS 29 Location: 40.484813 N, 94.290028 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Allendale, MO Allendale