63105 -- U.S. ZIP code Municipality (1990): CLAYTON, Missouri All ZIPs for this municipality (1990): 63105 Population (2000): 14490 Housing Units (2000): 6862 Land area (2000): 2.963661 sq. miles (7.675847 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 2.963661 sq. miles (7.675847 sq. km) Located within: Missouri (MO) Location: 38.645484 N, 90.328881 W