My staff and I consider it a privilege to serve the taxpayers of Washington County.  

- Melissa Thornbrugh, Treasurer

  • Washington
  • Melissa Thornbrugh, Treasurer
  • Location of Treasurer's Office:
  • 400 S Johnstone Ave Rm 200 Bartlesville, OK 74003
  • Phone: 918-337-2810
  • Fax: 918-337-2891
  • E-Mail:
  • Office Hours: Monday - Friday 8:00 AM to 5:00 PM

WELCOME TO THE Washington county treasurer WEBSITE!

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The Treasurer is an elected official serving a four-year term of office. The office is established by the Oklahoma Constitution, and the duties and responsibilities are set by Oklahoma State law.


The primary responsibility of the Treasurer is to receive, manage, and invest all revenues received by Washington County Government. The revenues include ad valorem property taxes, business personal property taxes, public service corporation taxes, Oklahoma Tax Commission payments and various other sources of revenue.


All revenues are fully invested daily and are either fully collateralized by government securities or are FDIC insured. Collections are balanced on a daily, monthly, and year-to-date basis which allows the investment of funds to be made with greater accuracy.

After collection, revenues are ultimately disbursed by the Treasurer. Funds are disbursed to the Public Schools, Tri County Technology Center and Municipalities within Washington County, and Washington  County Government.

TAX RATES                                   

The County Treasurer does NOT determine the amount of any tax. Taxable values are determined by the County Assessor and the County Equalization Board. Tax rates (sometimes referred to as "millage rates") are set by the Excise Board. Taxes are based upon budgets submitted by taxing jurisdictions, and include the amounts necessary to pay bonded indebtedness approved by a vote of the people.


The Treasurer’s office conducts a public auction on the 2nd Monday of each June. The auction is for the sale of real estate for non-payment of ad valorem property taxes or non-payment of special assessments such as cleaning and mowing. The sale is open to the public and all properties are sold to the highest bidder. Lists of these properties become available from our office in May preceding the June auction.


The Treasurer’s office is a public office and we are here to serve you. Our office hours are 8:00 a.m. to 5:00 p.m., Monday through Friday (except government holidays).



While the Treasurer's Office makes every effort to ensure the correctness of this website, any error contained herein does not constitute a waiver of any tax amounts by or for the County.