2026 Property Tax Due Dates
April 30
First half
October 31
Second half
Payment Methods
Online, Mail, In-Person
King County Treasurer
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to King County Treasurer
In Person
Visit the Treasurer's office — 201 S. Jackson St., Suite 710, Seattle WA 98104, Mon-Fri 8:30am - 4:30pm
Other Counties in Washington
About King County
King County is a county located in the U.S. state of Washington. The population was 2,269,675 in the 2020 census, making it the most populous county in Washington, and the 12th-most populous in the United States. The county seat is Seattle, also the state's most populous city.
Source: Wikipedia — content available under CC BY-SA 4.0
Related Resources
Get Deadline Reminders
We'll email you 20,160 minutes 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.