Hermiston, OR -- U.S. city in Oregon Population (2000): 13154 Housing Units (2000): 5383 Land area (2000): 6.462758 sq. miles (16.738466 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 6.462758 sq. miles (16.738466 sq. km) FIPS code: 33700 Located within: Oregon (OR), FIPS 41 Location: 45.840992 N, 119.291714 W ZIP Codes (1990): 97838 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Hermiston, OR Hermiston