Waterloo, OR -- U.S. town in Oregon Population (2000): 239 Housing Units (2000): 91 Land area (2000): 0.150959 sq. miles (0.390983 sq. km) Water area (2000): 0.000000 sq. miles (0.000000 sq. km) Total area (2000): 0.150959 sq. miles (0.390983 sq. km) FIPS code: 79050 Located within: Oregon (OR), FIPS 41 Location: 44.494308 N, 122.823170 W ZIP Codes (1990): Note: some ZIP codes may be omitted esp. for suburbs. Headwords: Waterloo, OR Waterloo