All Drop Boxes Open

The Benton County Treasurer's Office has opened 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: Open

7122 W Okanogan PL #E110, Kennewick, WA 99336

Benton County Prosser Courthouse: Open

620 Market St, Prosser, WA 99350

Richland City Hall: Open

625 Swift Blvd, Richland, WA 99352

Drop boxes will be closed at 5pm on Friday, October 31st, 2025