31407 -- U.S. ZIP code Municipality (1990): PORT WENTWORTH, Georgia All ZIPs for this municipality (1990): 31407 Population (2000): 3239 Housing Units (2000): 1363 Land area (2000): 33.944211 sq. miles (87.915098 sq. km) Water area (2000): 0.016903 sq. miles (0.043779 sq. km) Total area (2000): 33.961114 sq. miles (87.958877 sq. km) Located within: Georgia (GA) Location: 32.162963 N, 81.172339 W