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
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.
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%
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 Cowlitz County Tax Rate
0.87%
Median Effective Washington Tax Rate
0.92%
Median Effective United States Tax Rate
1.27%
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
$274,101
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.
Median Kelso Tax Bill
$3,240
Median Cowlitz County Tax Bill
$2,984
Median Washington Tax Bill
$4,512
Median United States Tax Bill
$3,209
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 |