Last-half Okanogan County property taxes and irrigation assessments are due (or must be postmarked by) Monday, Oct. 31. Interest and penalties start accruing Nov. 1 for any unpaid taxes.

Mail your taxes or assessments to Okanogan County Treasurer, P.O. Box 111, Okanogan, WA 98840.

Payments by credit card are accepted at or by calling 1-877-737-4772. Credit-card payments include a 2.5-percent service fee on the amount of tax being paid. Credit and debit card payments cannot be accepted at the counter in the treasurer’s office.

Contact the Okanogan County treasurer’s office at (509) 422-7180 with questions.