Alton, MO -- U.S. city in Missouri Population (2000): 668 Housing Units (2000): 364 Land area (2000): 0.837898 sq. miles (2.170147 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.837898 sq. miles (2.170147 sq. km) FIPS code: 00964 Located within: Missouri (MO), FIPS 29 Location: 36.693920 N, 91.399076 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Alton, MO Alton