Westlake, LA -- U.S. city in Louisiana Population (2000): 4668 Housing Units (2000): 1936 Land area (2000): 2.347728 sq. miles (6.080588 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 2.347728 sq. miles (6.080588 sq. km) FIPS code: 80815 Located within: Louisiana (LA), FIPS 22 Location: 30.248455 N, 93.259047 W ZIP Codes (1990): 70669 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Westlake, LA Westlake