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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  or call (509) 382-2131.

News and Announcements
NOTICE: Questions Regarding Ebola Virus
If you have questions regarding the Ebola Virus, please dial 211. If you have traveled to West Africa in the last month, and have flu symptoms: STAY HOME and call (509) 382-2534 extension 519 to receive additional instructions for care.
NOTICE: Special Meeting of the Board of Commissioners
The Board of Columbia County Commissioners has scheduled special meetings/workshops for October 22nd through October 24th. Please see the attached agenda for further information. Special Meeting Agenda
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