31816 -- U.S. ZIP code Municipality (1990): MANCHESTER, Georgia All ZIPs for this municipality (1990): 31816 Population (2000): 5819 Housing Units (2000): 2621 Land area (2000): 38.715164 sq. miles (100.271811 sq. km) Water area (2000): 0.085802 sq. miles (0.222225 sq. km) Total area (2000): 38.800966 sq. miles (100.494036 sq. km) Located within: Georgia (GA) Location: 32.862377 N, 84.608799 W