30021 -- U.S. ZIP code Municipality (1990): CLARKSTON, Georgia All ZIPs for this municipality (1990): 30021 Population (2000): 24374 Housing Units (2000): 9061 Land area (2000): 3.722995 sq. miles (9.642512 sq. km) Water area (2000): 0.008267 sq. miles (0.021412 sq. km) Total area (2000): 3.731262 sq. miles (9.663924 sq. km) Located within: Georgia (GA) Location: 33.809604 N, 84.238708 W