Downing, MO -- U.S. city in Missouri Population (2000): 396 Housing Units (2000): 210 Land area (2000): 0.665135 sq. miles (1.722692 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.665135 sq. miles (1.722692 sq. km) FIPS code: 19990 Located within: Missouri (MO), FIPS 29 Location: 40.487682 N, 92.368022 W ZIP Codes (1990): 63536 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Downing, MO Downing