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


Floating Property Reappraisal - June through August 2016

All houseboats, boathouses, other floating property and moorages in Columbia County are in the process of being reappraised for the 2016-17 tax year.  Columbia County staff appraisers will arrive in a marked county vehicle and will be wearing a blue-gray vest with the county logo in front and ASSESSOR clearly visible on the back.  Contact will be made with property owners or tenants who are on site at the time of the inspection, however, there will not be an attempt to contact owners who are not on site unless it is determined that additional information is necessary to complete the appraisal.  Most properties will be reappraised using data currently in our records combined with a limited exterior inspection to determine changes in inventory or condition.  If you have any questions, please call or email our office using the contact information shown above.

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.

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