Property tax collection for the current year cannot occur until the certification of the roll by the Treasurer's office (with the exception of personal property advance tax and long plat advance tax). At least one-half of the taxes due must be paid or postmarked before April 30th to avoid interest and penalty charges. If the first half is paid on time, the due date for payment of the remainder is October 31st. Taxes in an amount less than fifty dollars are to be paid in full by April 30th.

The Treasurer's office accepts a maximum of two bank-rolled rolls of coin.

Make checks payable to the Kittitas County Treasurer. NSF checks will be assessed a $35.00 fee per Resolution 2011-002.

Credit card payments

You will be charged a convenience fee (2.49% of payment amount/$2 minimum)
Takes most Credit cards, Debit cards & Bank cards
Note: You will need your parcel number and tax amount
  • By phone:

  • By internet:

  • Payments by mail:

    Kittitas County Treasurer
    205 W 5th AVE STE 102
    Ellensburg, WA 98926
  • Payments in person:

    Kittitas County Treasurer
    Kittitas County Courthouse
    205 W 5th AVE STE 102
    Ellensburg, WA 98926

    View a map or get driving directions.