31551 -- U.S. ZIP code Municipality (1990): MERSHON, Georgia All ZIPs for this municipality (1990): 31551 Population (2000): 943 Housing Units (2000): 398 Land area (2000): 64.694597 sq. miles (167.558229 sq. km) Water area (2000): 0.163386 sq. miles (0.423169 sq. km) Total area (2000): 64.857983 sq. miles (167.981398 sq. km) Located within: Georgia (GA) Location: 31.496025 N, 82.273224 W