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Payments By Mail/Drop Box

CHECK PAYMENTS (Endorsed to Benton County Treasurer and include Remit Coupon)


Benton County Treasurer
Tax Processing Center

7122 W Okanogan Pl #E110,

Kennewick, WA 99336


**Payments received via mail are applied according to the date of the US postmark. Please allow time for processing by the US Post Office to ensure timely payment.

DROP BOX LOCATIONS: Prosser and Kennewick drop boxes are now OPEN!

Drop boxes will be closed at 5pm on the due date. (If the April 30th or October 31st due date falls on a Saturday or Sunday the due date then becomes the following Monday.)

Prosser: Benton County Courthouse, 620 Market St. Prosser, WA 99350 (MAP)
Kennewick: Benton County Administration Building, 7122 W Okanogan Pl #E110, Kennewick, WA 99336 (MAP)


Prosser: (509)786-2255
Kennewick: (509)735-8505

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