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Emergency Alert
Columbia County
341 E. Main St.
Dayton, WA 99328

Chris Mills

341 E. Main St.
Suite 6
Dayton, WA  99328

Ph: (509) 382-2131
Fx: (509) 382-4830

Monday - Friday
8:30 am - 4:30 pm
The county Assessor determines the value of all taxable real and personal property in the county for the purpose of distributing tax liabilities in an equitable manner. 

Tax Exemption Records
The Assessor is also responsible for processing and maintaining records regarding tax exemptions including:
  • Churches
  • Historical properties
  • Public properties
  • Programs like open space and forest land
  • Senior citizens

Property Information
For property information questions, please email Deputy Assessor Melanie Mings or Chief Appraiser Tammy Ketterman or call (509) 382-2131.

News and Announcements
Notice of Public Hearing to Consider County Road Naming and Addressing
A Public Hearing will be held at 10:30 am on May 7, 2018 for the Board of Columbia County Commissioners to consider Ordinance 2018-003 – Columbia County Road Naming and Addressing Ordinance. The proposed ordinance is only applicable to the Read on...
Special Meeting of the BOCC
The Board of Columbia County Commissioners has scheduled a special meeting for Monday, April 23, 2018 at 10:00 a.m. in the Commissioners office. Please see the attached agenda for further information. Read on...
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