30401 -- U.S. ZIP code Municipality (1990): OAK PARK, Georgia All ZIPs for this municipality (1990): 30401 Population (2000): 12624 Housing Units (2000): 5378 Land area (2000): 249.612815 sq. miles (646.494195 sq. km) Water area (2000): 1.718293 sq. miles (4.450357 sq. km) Total area (2000): 251.331108 sq. miles (650.944552 sq. km) Located within: Georgia (GA) Location: 32.605196 N, 82.339102 W