Gardendale, AL -- U.S. city in Alabama Population (2000): 11626 Housing Units (2000): 4959 Land area (2000): 17.945095 sq. miles (46.477580 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 17.945095 sq. miles (46.477580 sq. km) FIPS code: 29056 Located within: Alabama (AL), FIPS 01 Location: 33.660492 N, 86.811648 W ZIP Codes (1990): 35071 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Gardendale, AL Gardendale