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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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Tax Payment Drop Boxes Will Be Open Temporarily

Updated: Mar 18

The Benton County Treasurer's Office has opened the drop boxes outside both the Prosser Courthouse and the Kennewick Annex for property tax payments. The drop boxes are designated for property tax payments made by check.

The drop box locations are:

Benton County Kennewick Annex:

5600 W. Canal Dr, Kennewick, WA 99336

Benton County Prosser Courthouse:

620 Market St, Prosser, WA 99350