63565 -- U.S. ZIP code Municipality (1990): UNIONVILLE, Missouri All ZIPs for this municipality (1990): 63565 Population (2000): 3948 Housing Units (2000): 2240 Land area (2000): 281.122472 sq. miles (728.103828 sq. km) Water area (2000): 1.727571 sq. miles (4.474389 sq. km) Total area (2000): 282.850043 sq. miles (732.578217 sq. km) Located within: Missouri (MO) Location: 40.472841 N, 92.972985 W