Benton County, WA Property Tax: $2,910/yr (2026)
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The effective property tax rate in Benton County is 0.79% of assessed home value. On a home at the county median value of $369,400, that works out to about $2,918 per year, or $243 per month. Benton County is located in southern Washington, and is home to approximately 210,224 residents.
About Benton County
Benton County covers approximately 1,700.1 square miles in Washington. The county is home to about 210,224 residents living in roughly 81,792 housing units, of which 64.2% are owner-occupied. The median household income is $87,316, and the median home was built in 1987.
Benton County borders Morrow County, Umatilla County, Franklin County, Grant County, Klickitat County — useful comparisons if you're considering nearby areas with potentially different tax rates.
How Property Taxes Work in Washington
Property taxes in Washington are administered at the county level. Each county sets a millage rate applied to the assessed value of real property — the effective rate above accounts for any partial assessments and exemptions already built into the local tax base. Assessed value can differ meaningfully from current market value depending on how often the county reassesses and what fraction of market value it uses.
Most counties in Washington offer exemptions that reduce the taxable assessed value: homestead exemptions for primary residences, senior exemptions, disability exemptions, and veteran exemptions are common. These reduce your effective rate below the county-wide average shown here. Contact the Benton County Assessor's office to learn which exemptions apply to your property and when to file.
Benton County vs. Neighboring Counties
| Location | Eff. Rate | Median Home | Annual Tax |
|---|---|---|---|
| Benton County, WA | 0.79% | $369,400 | $2,918 |
| Washington state average | 0.76% | — | $2,807* |
| Morrow County | 0.82% | $229,800 | $1,885 |
| Umatilla County | 0.99% | $256,100 | $2,534 |
| Franklin County | 0.76% | $345,700 | $2,638 |
| Grant County | 0.82% | $275,700 | $2,268 |
| Klickitat County | 0.62% | $388,700 | $2,401 |
| US national average | 1.10% | $281,900 | $3,101 |
*State average annual tax computed at Benton County's median home value of $369,400. Source: US Census ACS 2023 5-year estimates.
Frequently Asked Questions
How does Benton County's property tax rate compare to the rest of Washington?
At 0.79%, Benton County is higher than the Washington state average of 0.76%. On a home at the county median of $369,400, that means about $2,918 per year — versus $2,807 at the state average rate, a difference of $111 per year. Compared to the national average of 1.10%, Benton County is below average.
What's a typical annual property tax bill in Benton County?
For a home at the county median value of $369,400, the annual property tax in Benton County is approximately $2,918 — or about $243 per month. For a home worth $554,100, expect around $4,377 per year. For a $738,800 home, approximately $5,837 per year. Use the calculator above to estimate taxes for any assessed value.
Where do I appeal a Benton County property tax assessment?
Property assessment appeals in Benton County are handled by the Benton County Assessor's office. Most jurisdictions require filing within 30–90 days of receiving your assessment notice — confirm the specific deadline with the assessor's office before submitting, as deadlines and procedures vary by county. A successful appeal can reduce your assessed value and lower your tax bill for the current and future tax years.
What exemptions are available in Benton County?
Washington counties commonly offer homestead exemptions for owner-occupied primary residences, senior citizen exemptions for qualifying homeowners aged 65 and older, exemptions for disabled residents, and veterans' exemptions. Each exemption reduces your assessed taxable value, which in turn reduces your effective tax rate below the county-wide 0.79% shown here. Contact the Benton County Assessor's office to confirm which exemptions are available and the application deadlines.
Data sources: US Census Bureau ACS 2023 5-Year Estimates, US Census Gazetteer (2024), County Adjacency File