30291 -- U.S. ZIP code Municipality (1990): UNION CITY, Georgia All ZIPs for this municipality (1990): 30291 Population (2000): 12255 Housing Units (2000): 5588 Land area (2000): 10.420799 sq. miles (26.989744 sq. km) Water area (2000): 0.086872 sq. miles (0.224998 sq. km) Total area (2000): 10.507671 sq. miles (27.214742 sq. km) Located within: Georgia (GA) Location: 33.580878 N, 84.546110 W