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, Suite 240, Assessment & Taxation Department, Cartography Division Office:
Ownership Books [Tax Lot], vol. 1-333, 335-392, 1959-2005 (391 volumes).