63389 -- U.S. ZIP code Municipality (1990): WINFIELD, Missouri All ZIPs for this municipality (1990): 63389 Population (2000): 4580 Housing Units (2000): 1778 Land area (2000): 45.464575 sq. miles (117.752703 sq. km) Water area (2000): 0.191714 sq. miles (0.496536 sq. km) Total area (2000): 45.656289 sq. miles (118.249239 sq. km) Located within: Missouri (MO) Location: 39.000060 N, 90.772099 W