31520 -- U.S. ZIP code Municipality (1990): GLYNCO, Georgia All ZIPs for this municipality (1990): 31520 Population (2000): 21796 Housing Units (2000): 9718 Land area (2000): 45.392559 sq. miles (117.566184 sq. km) Water area (2000): 1.984564 sq. miles (5.139997 sq. km) Total area (2000): 47.377123 sq. miles (122.706181 sq. km) Located within: Georgia (GA) Location: 31.166786 N, 81.492137 W