31042 -- U.S. ZIP code Municipality (1990): IRWINTON, Georgia All ZIPs for this municipality (1990): 31042 Population (2000): 2136 Housing Units (2000): 910 Land area (2000): 101.657690 sq. miles (263.292197 sq. km) Water area (2000): 0.146527 sq. miles (0.379504 sq. km) Total area (2000): 101.804217 sq. miles (263.671701 sq. km) Located within: Georgia (GA) Location: 32.761500 N, 83.161204 W