30504 -- U.S. ZIP code Municipality (1990): GAINESVILLE, Georgia All ZIPs for this municipality (1990): 30501 30504 30506 30507 Population (2000): 15501 Housing Units (2000): 5600 Land area (2000): 16.506269 sq. miles (42.751038 sq. km) Water area (2000): 0.000034 sq. miles (0.000088 sq. km) Total area (2000): 16.506303 sq. miles (42.751126 sq. km) Located within: Georgia (GA) Location: 34.274355 N, 83.870034 W