63942 -- U.S. ZIP code Municipality (1990): GATEWOOD, Missouri All ZIPs for this municipality (1990): 63942 Population (2000): 672 Housing Units (2000): 330 Land area (2000): 92.727268 sq. miles (240.162512 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 92.727268 sq. miles (240.162512 sq. km) Located within: Missouri (MO) Location: 36.546354 N, 91.054024 W