• New Office Hours for 2018: the Assessor’s Office is open to the public Monday through Thursday, 9:00 AM to 4:00 PM.  
    Please note that our office is closed on Fridays.


  • June - July: Appraisers are inspecting properties, throughout the county, for new construction.

    The Assessor is authorized to value new construction and renovation work each year, for which a building permit was issued or should have been issued. The new construction value shall be based on its status—stage of completion—as of July 31st of the assessment year (WAC 458-12-342).


Melody Peterson
Mason County Assessor

This website is designed for residents and visitors seeking information about real estate as it relates to the property tax system in Mason County. Our primary responsibility to the taxpayers of Mason County is to establish fair and equitable value for all real and personal property.


The Assessor's Role

The Assessor is responsible for maintaining a list of all real and personal property parcels, including assessment of value and current ownership.  As required by law, the Assessor prepares, possesses and updates a complete set of maps drawn from legal descriptions, to indicate all parcel configurations for land in the County.  The Assessor sets current market values and calculates levies based on the taxing district’s budgets.  This office also administers senior/disability property tax exemptions, and forest or agriculture programs. This office works to treat everyone fairly and promptly. 

If you have questions, please feel free to contact us:

Shelton (360) 427-9670 │ Belfair (360) 275-4467 │ Elma (360) 482-5269
Extension 491

411 N 5th Street │PO Box “J”
County Building 1, 2nd floor