Columbia County Courthouse

230 Strand Street, St. Helens, OR 97051 • Phone: (503) 397-7210 • Toll Free: (888) 397-7210

Columbia County

Assessor's Office

Contact Info

  • Assessor:  Sue Martin

  • Office Hours:  Monday thru Friday, 8:30 a.m. to 5:00 p.m.  We are closed the second Thursday of each month from 8:30 a.m. to 12:00 p.m. for staff work sessions and training.

  • Location: Columbia County Courthouse Annex, 230 Strand, Saint Helens, Oregon

  • Phone: 503-397-2240  Fax: 503-397-5153 

  • Email: This email address is being protected from spambots. You need JavaScript enabled to view it.


Search for Assessment and Tax Data Online


Notice to Manufactured Home Owners

As of  May 1, 2017, the Columbia County Assessor's Office will again be able to process  applications for manufactured home ownership or situs changes.  We will continue to provide certification that taxes have been paid for those who choose to process the change online though the Building Codes Division (BCD) of the Oregon Department of Business and Consumer Services (DCBS) website.  Please visit for more information.

Publications and Presentations

Team Approach to Mass Appraisal

Faced with continued budget shortfalls and limited resources, Columbia County Property Appraisers developed a more efficient method of inspections that increased productivity and morale while maintaining a safe work environment.  This is a powerpoint presentation video narrated by the appraisal staff.

Recent History of Oregon's Property Tax System

Written by Tom Linhares, retired director of Multnomah County Tax Supervising & Conservation Commission, and previous Columbia County Assessor

Oregon's Property Tax System Summary (narrated video version)

Short video presentation on the changes to Oregon's Property System since 1990 and the limitations of our current system.

Mission Statement

The mission of the Columbia County Assessor's Office is to apportion the cost of supporting local public service districts, on behalf of the patrons of those districts, so no taxpayer is required to pay more or less than their fair share by annually producing an accurate and timely assessment roll that complies with Oregon Revised Statutes and Oregon Administrative Rules.

(Click here to download Adobe Reader)