St. Ann, MO -- U.S. city in Missouri Population (2000): 13607 Housing Units (2000): 6554 Land area (2000): 3.126001 sq. miles (8.096306 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 3.126001 sq. miles (8.096306 sq. km) FIPS code: 63956 Located within: Missouri (MO), FIPS 29 Location: 38.727184 N, 90.385515 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: St. Ann, MO St. Ann