Contact us by phone:

  • (360) 427-9670 Ext: 491


  • 411 N 5th St, Shelton, WA 98584
  • PO BOX J, Shelton, WA 98584
  • 08/05/2022 - New - As of August 8th, 2022, the UNCERTIFIED 2023 assessed values are available online at our website and are subject to change. You will receive a corrected Notice of Value if your value is corrected due to new construction, destroyed property, manifest error, segregation or sales review. These are based upon property values as of January 1, 2022 and will be used when calculating property tax obligations payable in 2023. The Assessor is required by state law to appraise property at 100% of market value. Please call or come in with questions or concerns.


Patti McLean
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
Extension 491

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