Kelso, Cowlitz County, Washington Property Taxes

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Property Taxes in Kelso, Washington

Median Kelso, Washington effective property tax rate: 0.99%, significantly lower than the national median of 1.02%, and higher than the Washington state median of 0.92%.
Median Kelso, Washington home value: $310,035
Median annual Kelso, Washington tax bill: $3,240, $840 higher than the national median property tax bill of $2,400.

How are property taxes in Cowlitz calculated?

Property taxes in Kelso, Washington are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.

Understanding Kelso's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Kelso, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Kelso, Cowlitz County, Washington Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

0.99%

Estimate Property Tax Bill

$3,069

$2,848

How Does the Kelso Property Tax Calculator Work?

Use this Kelso property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Kelso's median effective tax rate of 0.99% — based on actual property records in Cowlitz County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local assessment system uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Kelso's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.

Your bill may vary by ZIP code within Kelso: rates are 0.99% in 98626, primarily due to differences in school district levies and local assessment districts.

For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across Kelso.

About Kelso Property Taxes

About Property Taxes in Kelso, Cowlitz, Washington

Kelso's median effective property tax rate of 0.99% is lower than the Washington state median of 0.92% and lower than the national median of 1.02%. This rate reflects the Cowlitz County base levy combined with local school district levies and Local improvement districts (LIDs) that vary by subdivision throughout the city.

Property tax rates are not uniform across Kelso. Homeowners in ZIP code 98626 carry a median effective rate of 0.99%, while those in 98626 pay 0.99%. This spread reflects how school district boundaries and local assessment districts are drawn across Cowlitz County. Understanding which part of Kelso you live in can make a meaningful difference to your annual tax bill.

Kelso homeowners who believe their assessed value is too high can file a formal appeal with the local Tax Assessor before the July 1, 2026 deadline each year.

If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.

Property Tax Rates Across Kelso, Cowlitz County, Washington

As noted earlier, local government entities set tax rates, which can vary widely within a state.

Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.

While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.

Below, you can compare Kelso's effective property tax rate to other cities in Washington and the median property tax rates in Washington and the U.S.

Property Tax Rates Across Kelso, Cowlitz County, Washington

Source: Ownwell

0.74%

0.87%

0.99%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective Kelso Tax Rate

0.99%

Median Effective Cowlitz County Tax Rate

0.87%

Median Effective Washington Tax Rate

0.92%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Kelso, Cowlitz County, Washington

Zip	10th Percentile	25th Percentile	Median Tax Rate	75th Percentile	90th Percentile
98626	0.80%	0.97%	0.99%	1.21%	1.42%

Source: Ownwell

Property Tax Assessment Values Across Kelso, Cowlitz County, Washington

When examining property taxes in Kelso, Washington, understanding the distinction between "market value" and "assessed value" is crucial.

The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The Cowlitz County assessor estimates the market value for tax purposes.

The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.

Assessment notices:

In Cowlitz County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of May.

Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in Kelso.

For example, the median home price in Kelso is $310,035, with tax bills ranging significantly across the county. 98626 has the highest median home price at $310,035.

Property Tax Assessment Values Across Kelso, Cowlitz County, Washington

Source: Ownwell

$251,115

$353,353

$455,590

Median Kelso Market Value

$310,035

Median Cowlitz County Market Value

$341,430

Median Washington Market Value

$501,600

Median United States Market Value

$235,294

Property Tax Assessment Values Across Kelso, Cowlitz County, Washington

Zip	10th Percentile	25th Percentile	Median Home Price	75th Percentile	90th Percentile
98626	$126,262	$227,982	$310,035	$401,548	$530,867

Source: Ownwell

Property Tax Bills Across Kelso, Cowlitz County, Washington

Property tax bills in Kelso are based on the assessed value of a home and the tax rates set by local taxing authorities in Cowlitz County. When a home’s assessed value rises, the property tax bill can increase as well, even if the homeowner has not made any changes to the property. For Kelso homeowners, the median home price is $310,035, and the median tax bill is $3,240, which is above the national median property tax bill of $2,400 and the national median property tax rate of 1.02%.

Several factors influence the final bill, including the home’s assessed value, local levies, and exemptions that may apply. Bills can vary widely across the city, with the 25th percentile at $2,215 and the 75th percentile at $4,452, while the 90th percentile reaches $5,578. That range shows how much property taxes can differ from one homeowner to another, depending on how a property is assessed and which local rates are applied.

Property Tax Bills Across Kelso, Cowlitz County, Washington

Source: Ownwell

$2,070

$2,911

$3,751

Median Kelso Tax Bill

$3,240

Median Cowlitz County Tax Bill

$2,984

Median Washington Tax Bill

$4,512

Median United States Tax Bill

$2,400

Property Tax Bills Across Kelso, Cowlitz County, Washington

Zip	10th Percentile	25th Percentile	Median Tax Bill	75th Percentile	90th Percentile
98626	$693	$2,215	$3,240	$4,452	$5,578

Source: Ownwell

Don't miss the deadline to appeal!

Dates
Appeal Deadline	July 1
Tax Bill
Issued	February 10
Due Date #1	April 30
Due Date #2	October 31

Links
Cowlitz Tax Assessor
Website	cowlitzinfo.net

Frequently Asked Property Tax Questions in Kelso, Washington

How are property taxes calculated in Kelso, Washington?

Property taxes in Kelso, Washington are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.

How do I appeal my property taxes in Kelso, Washington?

To appeal your property taxes in Kelso, Washington, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.

What property tax exemptions are available in Kelso, Washington?

Common property tax exemptions in Kelso, Washington include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.

When are property taxes due in Kelso, Washington?

Property tax deadlines in Kelso, Washington vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.

How can Ownwell help reduce my property taxes in Kelso, Washington?

Ownwell provides professional property tax appeal services in Kelso, Washington. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.