31620 -- U.S. ZIP code Municipality (1990): ADEL, Georgia All ZIPs for this municipality (1990): 31620 Population (2000): 9828 Housing Units (2000): 4027 Land area (2000): 119.339900 sq. miles (309.088910 sq. km) Water area (2000): 2.942997 sq. miles (7.622327 sq. km) Total area (2000): 122.282897 sq. miles (316.711237 sq. km) Located within: Georgia (GA) Location: 31.133004 N, 83.427364 W