← Back to Washington

Columbia County Property Tax Due Date

Washington

(509) 382-2641

2026 Property Tax Due Dates

Official Source
Installment 1

April 30

First half

Installment 2

October 31

Second half

Pay Taxes Online →
Penalty: 3% June 1, +8% December 1Grace period: None

Payment Methods

Online, Mail, In-Person

Columbia County Treasurer

Office Address

341 E Main Street, Suite 5
Dayton, WA 99328

Get Directions

Office Hours

Mon-Fri 8:30am - 4:30pm

How to Pay

Online

Pay using credit card or e-check

Visit Website →

By Mail

Mail check payable to Columbia County Treasurer

Visit Website →

In Person

Visit the Treasurer's office — 341 E Main Street, Suite 5, Dayton WA 99328, Mon-Fri 8:30am - 4:30pm

Visit Website →

Other Counties in Washington

AdamsAsotinBentonChelanClallamClarkCowlitzDouglas

View all Washington counties →

About Columbia County

Columbia County is a county located in the U.S. state of Washington. As of the 2020 census, the population was 3,952, making it the second-least populous county in Washington. The county seat and largest city is Dayton.

Source: Wikipedia — content available under CC BY-SA 4.0

Related Resources

CountyRollCounty Office Directory

Find the assessor, treasurer & recorder for Columbia

View office directory
Property Tax FAQTax Calendar

Get Deadline Reminders

We'll email you 1,209,600 seconds 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.