You can pay Cowlitz Property taxes using one of the following methods:

In Office: The Cowlitz County Treasurer accepts checks or cash in office. During closed or busy office hours, you can use the drop box located outside of the Treasurer's Office doors.

By Mail: You can send your checks to: Cowlitz County Treasurer 207 N 4th Ave Kelso, WA 98626

All checks must be made payable to Cowlitz County Treasurer. If the payment coupon is not included please be sure to include the parcel number or account number. Your payment must be postmarked by the due date to be considered timely, otherwise interest and/or penalty will apply RCW 01.12.070.

By Phone: You can call 1-855-857-3624 to pay your property tax bill.