31305 -- U.S. ZIP code Municipality (1990): DARIEN, Georgia All ZIPs for this municipality (1990): 31305 Population (2000): 5171 Housing Units (2000): 2314 Land area (2000): 124.732512 sq. miles (323.055710 sq. km) Water area (2000): 0.371365 sq. miles (0.961832 sq. km) Total area (2000): 125.103877 sq. miles (324.017542 sq. km) Located within: Georgia (GA) Location: 31.407598 N, 81.390946 W