30818 -- U.S. ZIP code Municipality (1990): MATTHEWS, Georgia All ZIPs for this municipality (1990): 30818 Population (2000): 506 Housing Units (2000): 196 Land area (2000): 30.139152 sq. miles (78.060043 sq. km) Water area (2000): 0.006507 sq. miles (0.016853 sq. km) Total area (2000): 30.145659 sq. miles (78.076896 sq. km) Located within: Georgia (GA) Location: 33.244829 N, 82.326368 W