30274 -- U.S. ZIP code Municipality (1990): RIVERDALE, Georgia All ZIPs for this municipality (1990): 30274 30296 Population (2000): 32166 Housing Units (2000): 11881 Land area (2000): 11.051887 sq. miles (28.624254 sq. km) Water area (2000): 0.049003 sq. miles (0.126916 sq. km) Total area (2000): 11.100890 sq. miles (28.751170 sq. km) Located within: Georgia (GA) Location: 33.555145 N, 84.401084 W