30907 -- U.S. ZIP code Municipality (1990): MARTINEZ, Georgia All ZIPs for this municipality (1990): 30907 Population (2000): 45543 Housing Units (2000): 18033 Land area (2000): 23.505476 sq. miles (60.878900 sq. km) Water area (2000): 0.359055 sq. miles (0.929949 sq. km) Total area (2000): 23.864531 sq. miles (61.808849 sq. km) Located within: Georgia (GA) Location: 33.512541 N, 82.094915 W