63077 -- U.S. ZIP code Municipality (1990): SAINT CLAIR, Missouri All ZIPs for this municipality (1990): 63077 Population (2000): 11071 Housing Units (2000): 4791 Land area (2000): 88.820661 sq. miles (230.044445 sq. km) Water area (2000): 0.227048 sq. miles (0.588052 sq. km) Total area (2000): 89.047709 sq. miles (230.632497 sq. km) Located within: Missouri (MO) Location: 38.336093 N, 90.989022 W