Contact us by phone:

  • (360) 427-9670 Ext: 491


  • 411 N 5th St, Shelton, WA 98584
  • PO BOX J, Shelton, WA 98584

  • 2021/2022 Personal Property Returns (equipment listings) were mailed on January 27, 2021, and are due by Friday, April 30th. Listings filed after the due date will incur a monthly penalty of 5 percent of the tax due, not to exceed 25 percent.

    The Returns are for the 2021 assessment (equipment and ownership as of January 1, 2021) for taxes payable in 2022.

    Personal Property Returns can be submitted by the following options:
    If you have any questions, please contact (360) 427-9670 ext. 494, or

  • September 23rd, 2020 - The annual Assessor’s Notice of Value will be mailed to Mason County taxpayers on September 23, 2020. In accordance with RCW 84.40.045 & WAC 458-12-360, the Assessor is required to notify taxpayers of any change in the true and fair value of their property.

  • August 14, 2020 - Second and final renewal notices for the Senior Citizen/Disabled Persons Exemption from Real Property Taxes were mailed out August 14, 2020 for Areas 3 and 6. Completed renewal applications must be returned by October 1, 2020.

  • May 21, 2020 - In accordance with RCW 84.36.385, and WAC 458-16A-150, a reduction in taxes per the Senior Citizen/Disabled Persons Program may not continue unless the recipient submits a renewal application for exemption at least once every six years, or upon the Assessor’s request.

    Renewal applications for Areas 3 and 6 were mailed out May 22, 2020. Completed renewal applications must be returned by July 1, 2020.

    We understand that due to the current COVID-19 restrictions, acquiring and returning the appropriate documentation may be challenging. Renewal applications can be submitted by either email, mail, fax, outside drop box or by appointment. For questions, please call 360-427-9670 ext. 567 or email at

  • January 24, 2020 - Personal Property Returns (equipment listings) mailed to businesses in Mason County. Equipment listings must be filed by Thursday, April 30th, for property as of January 1, 2020. "Personal Property eFile" is currently under construction, but equipment listings may still be submitted electronically (excel format preferred) to

  • January 17, 2020 - The 2020 Mason County Levy Book, District Listing by Tax Code Area (TCA) and 2020 Levy Report is now available.


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 │ Elma (360) 482-5269
Extension 491

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