31791 -- U.S. ZIP code Municipality (1990): SYLVESTER, Georgia All ZIPs for this municipality (1990): 31791 Population (2000): 12927 Housing Units (2000): 5115 Land area (2000): 195.432510 sq. miles (506.167855 sq. km) Water area (2000): 0.970974 sq. miles (2.514812 sq. km) Total area (2000): 196.403484 sq. miles (508.682667 sq. km) Located within: Georgia (GA) Location: 31.536886 N, 83.860411 W