2026 Property Tax Due Dates
April 30
First half
October 31
Second half
Payment Methods
Online, Mail, In-Person
Mason County Treasurer
Treasurer
Patti McLean
Phone
(360) 427-9670Mailing Address
PO Box 429, Shelton, WA 98584
Office Hours
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Mason County Treasurer — PO Box 429, Shelton, WA 98584
In Person
Visit the Treasurer's office — 411 N 5th St, Building 1, 2nd Floor, Shelton WA 98584, Mon-Fri 8am - 5pm
Other Counties in Washington
About Mason County
Mason County is a county located in the U.S. state of Washington. As of the 2020 census, the population was 65,726. The county seat and only incorporated city is Shelton.
Source: Wikipedia — content available under CC BY-SA 4.0
Related Resources
Get Deadline Reminders
We'll email you 2 weeks before your property taxes are due.
Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.