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King County Assessor

Learn more about the Assessor. Learn more about how property assessments work and how to file an appeal. 

John Wilson is the current King County Assessor. The Assessor's office provides valuations for every property in the county.

How we do it:

  • Locate every taxable property in the county
  • Identify property ownership
  • Establish a taxable value
  • Apply legal exemptions to property taxes

The Assessor's office doesn't manage your property tax payments. The county's Treasury Department handles that.