63043 -- U.S. ZIP code Municipality (1990): MARYLAND HEIGHTS, Missouri All ZIPs for this municipality (1990): 63043 Population (2000): 22401 Housing Units (2000): 9858 Land area (2000): 11.834284 sq. miles (30.650653 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 11.834284 sq. miles (30.650653 sq. km) Located within: Missouri (MO) Location: 38.725331 N, 90.444516 W