30420 -- U.S. ZIP code Municipality (1990): COBBTOWN, Georgia All ZIPs for this municipality (1990): 30420 Population (2000): 2010 Housing Units (2000): 973 Land area (2000): 89.709033 sq. miles (232.345320 sq. km) Water area (2000): 0.360207 sq. miles (0.932932 sq. km) Total area (2000): 90.069240 sq. miles (233.278252 sq. km) Located within: Georgia (GA) Location: 32.301639 N, 82.118423 W