Philomath, OR -- U.S. city in Oregon Population (2000): 3838 Housing Units (2000): 1434 Land area (2000): 1.282328 sq. miles (3.321215 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 1.282328 sq. miles (3.321215 sq. km) FIPS code: 57450 Located within: Oregon (OR), FIPS 41 Location: 44.540443 N, 123.362787 W ZIP Codes (1990): 97370 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Philomath, OR Philomath