30121 -- U.S. ZIP code Population (2000): 15602 Housing Units (2000): 5661 Land area (2000): 55.627492 sq. miles (144.074538 sq. km) Water area (2000): 0.126569 sq. miles (0.327811 sq. km) Total area (2000): 55.754061 sq. miles (144.402349 sq. km) Located within: Georgia (GA) Location: 34.200264 N, 84.775332 W