31533 -- U.S. ZIP code Municipality (1990): DOUGLAS, Georgia All ZIPs for this municipality (1990): 31533 Population (2000): 16910 Housing Units (2000): 7378 Land area (2000): 74.072937 sq. miles (191.848017 sq. km) Water area (2000): 0.242180 sq. miles (0.627243 sq. km) Total area (2000): 74.315117 sq. miles (192.475260 sq. km) Located within: Georgia (GA) Location: 31.522042 N, 82.841538 W