31811 -- U.S. ZIP code Municipality (1990): HAMILTON, Georgia All ZIPs for this municipality (1990): 31811 Population (2000): 3912 Housing Units (2000): 1779 Land area (2000): 126.402641 sq. miles (327.381323 sq. km) Water area (2000): 0.523042 sq. miles (1.354673 sq. km) Total area (2000): 126.925683 sq. miles (328.735996 sq. km) Located within: Georgia (GA) Location: 32.722333 N, 84.958036 W