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
Engrossed House Bill (EHB) 2242
Funding education

 The 2017 Legislature passed

 Engrossed House Bill (EHB) 2242 

to meet its obligation to fully fund

basic education for public schools.

In addition to other education-related

requirements, this bill makes changes to:

Property taxes imposed by the state.

Certain voter-approved property taxes

imposed by school districts.

State funding for certain school districts.

For all information on the impact please visit:

Funding Education EHB 2242


8:30 a.m to 4:30 p.m.
Monday through Friday
(excluding holidays)

Prosser Courthouse

Second Floor
620 Market St
Prosser, WA 99350

Kennewick Annex

5600 W Canal Dr. # E
Kennewick, WA 99336

Phone      (509) 786-2046
Fax          (509) 786-5657
Toll Free  (509) 736-3088


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