Auburn, WA -- U.S. city in Washington Population (2000): 40314 Housing Units (2000): 16767 Land area (2000): 21.263410 sq. miles (55.071976 sq. km) Water area (2000): 0.005811 sq. miles (0.015050 sq. km) Total area (2000): 21.269221 sq. miles (55.087026 sq. km) FIPS code: 03180 Located within: Washington (WA), FIPS 53 Location: 47.302322 N, 122.214779 W ZIP Codes (1990): 98002 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Auburn, WA Auburn