31522 -- U.S. ZIP code Municipality (1990): SAINT SIMONS ISL, Georgia All ZIPs for this municipality (1990): 31522 Population (2000): 14697 Housing Units (2000): 9405 Land area (2000): 64.679358 sq. miles (167.518762 sq. km) Water area (2000): 0.137557 sq. miles (0.356271 sq. km) Total area (2000): 64.816915 sq. miles (167.875033 sq. km) Located within: Georgia (GA) Location: 31.176516 N, 81.380205 W