Seneca, OR -- U.S. city in Oregon Population (2000): 223 Housing Units (2000): 115 Land area (2000): 0.832671 sq. miles (2.156607 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.832671 sq. miles (2.156607 sq. km) FIPS code: 66200 Located within: Oregon (OR), FIPS 41 Location: 44.135605 N, 118.971854 W ZIP Codes (1990): 97873 Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Seneca, OR Seneca