All Drop Boxes CLOSED

The Benton County Treasurer's Office has CLOSED the drop boxes at the Prosser Courthouse, the Benton County Administration building in Kennewick, and Richland City Hall for property tax payments. The drop boxes are designed for property tax payments made by check. (NO CASH payments)

Benton County Kennewick Office: CLOSED

7122 W Okanogan PL #E110, Kennewick, WA 99336

Benton County Prosser Courthouse: CLOSED

620 Market St, Prosser, WA 99350

Richland City Hall: CLOSED

625 Swift Blvd, Richland, WA 99352

Drop boxes are now CLOSED as of 5pm on Friday, October 31st, 2025