31408 -- U.S. ZIP code Municipality (1990): GARDEN CITY, Georgia All ZIPs for this municipality (1990): 31408 Population (2000): 11131 Housing Units (2000): 4250 Land area (2000): 36.196279 sq. miles (93.747927 sq. km) Water area (2000): 0.048810 sq. miles (0.126418 sq. km) Total area (2000): 36.245089 sq. miles (93.874345 sq. km) Located within: Georgia (GA) Location: 32.106705 N, 81.169159 W