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Prosser Office

620 Market St

PO Box 630

Prosser, WA 99350

© 2017 by Benton County Treasurer

Kennewick Office

5600 W Canal Dr Ste A

Kennewick, WA 99336

Phone: 509-786-2255 or 509-735-8505


Hours: 8:30am - 4:30pm Monday - Friday

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Kenneth Spencer

Benton County Treasurer

Chief Deputy Treasurer


Kirsten Yniguez


Total Taxes Collected YTD

*Updated January 6th, 2020


First Half Property Taxes are Due April 30th, 2020


In response to Covid-19, the Benton County Treasurer's Office will be closed to the public. The office will reopen April 6th, 2020. Please utilize the drop boxes outside the Prosser and Kennewick offices for property tax payments. You can also make payments online using our property search. Please contact us via phone or email if you have any questions or need additional help.


Letter from the Treasurer

The Treasurer's Office is the property tax collector for Benton County and the Cities, School Districts, Fire Departments, and all the other taxing authorities in the County. Property Taxes are levied on the property by the various taxing authorities  based on the valuation and current property usage as set by the Assessor's Office.

As the "banker" for Benton County, the County Treasurer's Office is also responsible for collecting all other money other  County departments collect such as fees for services, licenses, and revenues from bond issues and special assessments.

As your Treasurer, I value your opinion and will consider it in establishing policies, designing services and updating our  service to you. If we have let you down, please tell me. If you are pleased, I would like to hear that too.

Kenneth Spencer, Jr.
Benton County Treasurer