Bill Spencer  

Bill Spencer

Benton County Assessor

Welcome to the Benton County Assessor’s Home Page

As your Benton County Assessor, I hope you find the information on our web site most helpful.  The goal of this web site is to help you find the information you need and to keep our “search for property” information open 24 hours a day, 7 days a week.

Please Visit our new Property search feature 

Mission Statement
Our mission is to administer a property assessment system, which meets constitutional and statutory requirements, in an efficient and professional manner, while striving to provide courteous and excellent service to our customers The Benton County Assessor’s Office is responsible for determining the value of all taxable real and personal property in the County, set on a foundation that those determinations are fair and understandable.  This is done in accordance with Washington State law, which requires that all properties are assessed at 100% of fair market value.  In addition, the Assessor’s Office manages accessible property information, provides timely and accurate assessments for tax purposes, and maintains a detailed parcel map of all parcels within the County.

Please Visit our new Property search feature by selecting the link below:

Property Search   


Treasurer's Office

Benton County    620 Market Street    Prosser, Washington 99350
Phone: (509) 786-5710 or (509) 783-1310
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