Find Property Tax Records in Cowlitz County

Cowlitz County property tax records are available through the Assessor's Office in Kelso and through the county's online property search portal. You can search by address, parcel number, or property ID to find assessed values, ownership information, and tax account details for any parcel in the county. This page covers how to use the online tools, what the Assessor and Treasurer offices do, and how the appeals and exemption processes work for Cowlitz County property owners.

Cowlitz County Assessor Property Tax Records

The Cowlitz County Assessor's Office is the primary source for property valuation and tax record data in the county. The office is located at 207 4th Avenue North, Kelso, WA. You can reach them by phone at (360) 577-3010 for questions about property values. The Assessor's mission is accuracy, equity, and fairness in how all properties are valued. The office strives to neither overestimate nor underestimate values so that the tax burden is distributed evenly across property owners.

All properties are assessed in a similar manner to support uniform taxation. Staff receive ongoing training and use current technology to keep pace with market changes. The Assessor also maintains GIS parcel data that feeds into the statewide parcel database managed by the Washington Department of Revenue. Property owners who disagree with a valuation can appeal to the County Board of Equalization. Visit the Cowlitz County Assessor page for contact details and links to online tools.

The screenshot below is from the Cowlitz County Assessor's official page, showing the office overview and links to the property search portal.

The Assessor page explains the valuation mission and links directly to the county's parcel search application and GIS tools.

Search Cowlitz County Property Tax Records Online

The county's main online property search tool is at cowlitzinfo.net. This portal lets you search by address, parcel number, or property ID. No registration is required. Once you find a parcel, you can see property characteristics, ownership information, and assessed values. Results can be narrowed by entering as much or as little search criteria as you want. The portal is maintained as part of the county's public records access program.

The Announcements section on the search portal shows updates from the Assessor's Office. Check there for news about revaluation cycles, new programs, or changes to the search system. The portal does not require you to know the exact parcel number. Searching by a partial address or owner name often returns results quickly enough to identify the parcel you need.

The screenshot below is from the Cowlitz County property information search portal, the primary online tool for looking up parcel data.

The portal displays a search toggle and input fields for address, parcel, and property ID searches, along with an announcements section from the Assessor's Office.

Cowlitz County GIS and Mapping Tools

The Cowlitz County GIS Department provides public web map applications and supports a wide range of spatial analysis projects. Web-based maps are available for property research, planning, and general reference use. The department handles specialized mapping tasks such as school bus routes, fire district boundary maps, and drone mapping for search-and-rescue operations.

GIS data comes from multiple sources and agencies. The county notes it is approximate and not intended for site-specific legal decisions. An online project request form is available if you need a custom GIS product. Public users can submit feedback or requests through that form. The Terms of Use on the GIS page explains how data can and cannot be used.

The screenshot below is from the Cowlitz County GIS Department page, which provides links to web map applications and project request forms.

The GIS page links to web-based maps useful for viewing parcel boundaries, fire district coverage, and other geographic layers across Cowlitz County.

Note: GIS maps are provided for general reference. Confirm legal descriptions and parcel boundaries through the Assessor or Auditor before relying on them in any transaction.

How Cowlitz County Property Tax Assessment Works

Washington State requires all property to be valued at 100% of fair market value under RCW 84.40. Cowlitz County follows this standard. The Assessor uses market data and mass-appraisal methods to set values that reflect what properties would sell for in an open market. Physical inspections happen at least once every six years, with sales analysis done annually to keep assessed values current between inspection cycles.

Real property includes land, buildings, and mobile homes. Personal property covers machinery, equipment, and business fixtures. Business owners must report personal property annually by April 30. The Assessor values it based on depreciated cost. Household goods and personal effects are exempt from property taxation under state law.

Cowlitz County Property Tax Payment

The Cowlitz County Treasurer's Office handles all property tax billing and collection. The Treasurer acts as the bank for the county, school districts, fire districts, and port districts. Tax statements for 2026 were mailed on February 17. First half 2026 property taxes are due April 30. You can look up your current tax amount due or pay taxes online directly from the Treasurer's page.

Under RCW 84.56, taxes over $50 may be paid in two halves. First half is due April 30 and second half is due October 31. A postmark of the due date counts as timely. In-office payments accepted include checks and cash. Drop boxes are located at the North and South entrances and in the North Parking Lot for after-hours payments. Credit and debit card payments can be made online or by phone through Point and Pay.

Unpaid balances continue to accrue interest and penalty at the statutory rate. The Treasurer also holds finance meetings at 9 AM on the third Thursday of January, April, July, and October. These meetings address county financial matters and debt financing.

The screenshot below is from the Cowlitz County Treasurer's page, which links to the tax payment portal and the Assessor parcel search.

The Treasurer's page provides quick links to look up your tax amount, pay online, and access the Assessor's parcel search system.

Cowlitz County Property Tax Due Dates and FAQ

The county's property tax FAQ page covers the most common questions from property owners. Annual due dates are April 30 and October 31, as required by RCW 84.56.020. A first-half payment must carry a postmark of April 30 to be considered timely. The same rule applies to the October 31 second-half deadline. If your bill is small enough to require a single payment, it is all due by April 30.

Lenders handling escrow accounts can look up tax amounts via the Assessor parcel search. The Treasurer sends yearly statements to the owner of record as required by state law. If you did not receive your statement, contact the Treasurer's Office. Not receiving a statement does not waive the obligation to pay on time.

The screenshot below is from the Cowlitz County property tax FAQ page, covering due dates, payment methods, and drop box locations.

The FAQ page answers questions about payment timing, drop box access, credit card fees, and what happens when taxes remain unpaid past the due date.

Cowlitz County Auditor and Recorded Documents

The Cowlitz County Auditor's Office serves as the county recorder under Washington State law. The office handles elections, licensing, recording, and accounting services. The Recording Services division provides access to documents affecting real property, including deeds, mortgages, and liens.

Cowlitz County offers an online recorded document search at cowlitzinfo.net public records search. You can search and view recorded document images online by grantor or grantee name, document type, or recording date. The system is open to the public for free basic searches. Certified copies carry a fee and can be requested through the Auditor's Office. The Auditor's phone number for recorded document questions is (360) 577-3016.

The screenshot below is from the Cowlitz County Auditor's Office page, which includes an embedded tutorial video and a direct link to the online document image search system.

The Auditor page covers all divisions including recording, elections, and licensing, with direct links to the public record search portal.

Note: Recording fees and document standards are set by state law and county ordinance. Contact the Auditor at (360) 577-3016 for current fee schedules and document submission requirements.

Cities in Cowlitz County

Cowlitz County includes Longview, which qualifies for its own page in this directory. The county also includes Kelso (county seat), Castle Rock, Kalama, Woodland, and several smaller communities. All property tax records for parcels anywhere in Cowlitz County are processed through the Assessor and Treasurer offices in Kelso, regardless of which city the property is located in.

Nearby Counties

These counties border Cowlitz County in southwestern Washington. Each has its own assessor and treasurer for property tax records.