Festus, MO -- U.S. city in Missouri Population (2000): 9660 Housing Units (2000): 4040 Land area (2000): 4.781653 sq. miles (12.384424 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 4.781653 sq. miles (12.384424 sq. km) FIPS code: 24094 Located within: Missouri (MO), FIPS 29 Location: 38.219490 N, 90.400936 W ZIP Codes (1990): 63028 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Festus, MO Festus