30115 -- U.S. ZIP code Population (2000): 20076 Housing Units (2000): 7254 Land area (2000): 61.746288 sq. miles (159.922144 sq. km) Water area (2000): 0.180371 sq. miles (0.467158 sq. km) Total area (2000): 61.926659 sq. miles (160.389302 sq. km) Located within: Georgia (GA) Location: 34.194029 N, 84.438847 W