2026 Property Tax Due Dates
April 30
First half
Delinquent after: April 30
October 31
Second half
Delinquent after: October 31 (falls on a weekend; penalty-free through Monday, November 2)
Payment Methods
Online, Mail, In-Person
San Juan County Treasurer
Phone
(360) 378-2171Mailing Address
P.O. Box 639, Friday Harbor, WA 98250
Office Hours
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to San Juan County Treasurer — P.O. Box 639, Friday Harbor, WA 98250
In Person
Visit the Treasurer's office — 350 Court Street, Friday Harbor WA 98250, Mon-Fri 8:30am - 4:30pm
About Property Taxes in Washington
Washington State property taxes are administered at the county level. Property is assessed at 100% of its true and fair market value as of January 1. Washington levies both a state property tax (used for schools) and local taxes (county, city, school district, fire district, and others). The combined rates vary significantly by county. Washington's property tax system has strong protections for seniors and low-income homeowners, including an exemption that reduces or eliminates taxes for qualifying households regardless of property value.
Payment & Assessment
Washington property taxes are paid in two equal installments: First half: Due April 30 Second half: Due October 31 If the total tax is under $50, the full amount is due April 30. For residential property with four or fewer units (including manufactured homes), late payments carry no penalty, just 9% annual interest until paid. Other property types are charged a higher interest rate. If a deadline falls on a weekend or holiday, it moves to the next business day. Most counties offer online payment through the county treasurer's website. Contact your county for payment options.
Statewide framework for Washington. Your county's specific rates and deadlines are shown above.
Other Counties in Washington
About San Juan County
San Juan County is a county in the Salish Sea in the far northwestern corner of the U.S. state of Washington. As of the 2020 census, its population was 17,788. The county seat and only incorporated town is Friday Harbor, on San Juan Island. The county was formed on October 31, 1873, from Whatcom County and is named for the San Juan Islands, which are in turn named for Juan Vicente de Güemes, 2nd Count of Revillagigedo, the Viceroy of New Spain.
Source: Wikipedia — content available under CC BY-SA 4.0
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Due dates shown are for reference only. Contact the San Juan County Treasurer's office to confirm official deadlines before making payments.