Oregon Historical County Records Guide
Washington County Records Inventory
Tax Lot Cards
Tax lot cards, which contain official descriptions of real property, are used to track land ownership and lot size and also may serve as a deed reference. Records include tax lot number; the location of the land in reference to township, range, and section; and a description and record of changes to the property, acreage, and land owner.
The searchable InterMap GIS database includes tax lot information.
Records at the Public Services Building, Second Floor, Assessment and Taxation Department Cartography Office:
Ownership Books [Tax Lot], vol. 1-333, 335-392, 1959-2005 (391 volumes).
Records at the Public Services Building, Conference Room 235, Assessment and Taxation Temporary Map Storage Area:
[Tax Lot Maps-Oregon Blue Print Co.], 1949-1950 (1 volume).