How to appeal a Washington County, OR property assessment
✓ Verified — Last verified October 24, 2026
Filing details published for Washington County. Match the notice and assessment cycle to the official instructions.
Official appeal instructionsNot tax or legal advice; confirm with your county.
Filing timing
Where to file
File a petition with the Washington County Clerk for the Property Value Appeals Board.
Official source. Verified .
Assessment notice period
The tax statement includes current and prior-year values; statements are mailed October 16–20, 2026.
Official source. Verified .
Official offices
Washington County Department of Assessment & Taxation
Sources for these instructions
https://www.washingtoncountyor.gov/at/news/2026/10/16/2026-27-property-tax-statement
Appeals of value may be filed until December 31, 2026.
Verified October 24, 2026
https://www.washingtoncountyor.gov/at/appraisal/bpp/property-value-appeals-formally-board-property-tax-appeals-bopta
Petitions are filed in the office of the county clerk in the county where the property is located.
Verified October 24, 2026
https://www.washingtoncountyor.gov/at/appraisal/bpp/property-value-appeals-formally-board-property-tax-appeals-bopta
Property Value Appeals Board
Verified October 24, 2026
Continue with your property
Common questions
Where do I file a Washington County assessment appeal?
File a petition with the Washington County Clerk for the Property Value Appeals Board.
Updated , from cited verification dates. Individual sources may have earlier checks.