30113 -- U.S. ZIP code Municipality (1990): BUCHANAN, Georgia All ZIPs for this municipality (1990): 30113 Population (2000): 5674 Housing Units (2000): 2332 Land area (2000): 105.529228 sq. miles (273.319433 sq. km) Water area (2000): 0.498283 sq. miles (1.290548 sq. km) Total area (2000): 106.027511 sq. miles (274.609981 sq. km) Located within: Georgia (GA) Location: 33.846270 N, 85.202919 W