30471 -- U.S. ZIP code Municipality (1990): TWIN CITY, Georgia All ZIPs for this municipality (1990): 30471 Population (2000): 4364 Housing Units (2000): 1770 Land area (2000): 156.618109 sq. miles (405.639022 sq. km) Water area (2000): 1.515862 sq. miles (3.926065 sq. km) Total area (2000): 158.133971 sq. miles (409.565087 sq. km) Located within: Georgia (GA) Location: 32.547214 N, 82.170485 W