Office Hours:
Office Hours 8:30 - 4:30 M-F

Happening Now

Third Week of October: Change of Value Notices

September 1: Appraisers will begin physically inspecting Area 5 of Mason County: Allyn, Grapeview, Mason Lake


Welcome to the office of the Assessor

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