63386 -- U.S. ZIP code Municipality (1990): WEST ALTON, Missouri All ZIPs for this municipality (1990): 63386 Population (2000): 598 Housing Units (2000): 298 Land area (2000): 30.742344 sq. miles (79.622303 sq. km) Water area (2000): 0.414607 sq. miles (1.073826 sq. km) Total area (2000): 31.156951 sq. miles (80.696129 sq. km) Located within: Missouri (MO) Location: 38.876781 N, 90.237062 W