Cowlitz County, WashingtonProperty records & tax offices
Links open the listed public-office or service-provider website in a new tab. This directory does not collect payments.
Find the right property record
Use the property portal for ownership and assessed value, the collector for a bill or balance, and the map for parcel location. Have the address, owner name, or parcel number ready.
Tax bills & filing dates
These are the dates and qualifications recorded in the directory. Confirm your tax year and current deadline with the official office and your property’s notice.
- Tax bill mailing
- February 17, 2026; the official Treasurer states 2026 tax statements were mailed February 17.
- Payment deadline
- First-half and full-year payments are due April 30, 2026; second-half payments are due October 31, 2026. If the total bill is $50 or less, the full amount is generally due April 30.
- Assessment appeal
- July 1, 2026 or within 30 calendar days of the Change of Value/valuation notice mailing date, whichever is later; petition to the Cowlitz County Board of Equalization.
Exemptions & appeals
Exemption filing
December 31, 2025 for the 2026 tax year; Washington's senior/disabled exemption applications and supporting documents are due by December 31 of the assessment year, subject to county acceptance of late applications.
Senior relief
Washington senior/disabled exemption: generally age 61+ or disabled/qualifying veteran, own and occupy a primary residence for at least six months, with the 2024-2026 maximum combined disposable income of $54,000; exemption freezes value and reduces eligible levies. The deferral threshold is $57,273.
Valuation limits
Washington's 1% property-tax limit applies to taxing-district levy revenue, not to an individual parcel's assessed value. The county assesses property at 100% of true and fair market value; individual assessed values can rise or fall with market conditions. Senior/disabled relief and current-use classifications are separate programs, not general valuation caps.
For a valuation appeal, use the appeal date in the tax and filing section above. Keep your notice, supporting evidence, and proof of submission.
More exemption & appeal guidance →