31328 -- U.S. ZIP code Municipality (1990): TYBEE ISLAND, Georgia All ZIPs for this municipality (1990): 31328 Population (2000): 3713 Housing Units (2000): 2859 Land area (2000): 23.802978 sq. miles (61.649427 sq. km) Water area (2000): 0.020090 sq. miles (0.052033 sq. km) Total area (2000): 23.823068 sq. miles (61.701460 sq. km) Located within: Georgia (GA) Location: 32.006672 N, 80.849374 W