31503 -- U.S. ZIP code Population (2000): 21038 Housing Units (2000): 8590 Land area (2000): 339.032713 sq. miles (878.090658 sq. km) Water area (2000): 2.523092 sq. miles (6.534779 sq. km) Total area (2000): 341.555805 sq. miles (884.625437 sq. km) Located within: Georgia (GA) Location: 31.205194 N, 82.375342 W