63084 -- U.S. ZIP code Municipality (1990): UNION, Missouri All ZIPs for this municipality (1990): 63084 Population (2000): 13864 Housing Units (2000): 5492 Land area (2000): 69.488935 sq. miles (179.975508 sq. km) Water area (2000): 0.066525 sq. miles (0.172299 sq. km) Total area (2000): 69.555460 sq. miles (180.147807 sq. km) Located within: Missouri (MO) Location: 38.434806 N, 91.003530 W