Castle Rock, Lewis County, Washington Property Taxes

$774 avg. annual savings

No Upfront Costs

You only pay if we save

Property Taxes in Castle Rock, Washington

Median Castle Rock, Washington effective property tax rate: 0.79%, significantly lower than the national median of 1.02%, and lower than the Washington state median of 0.92%.
Median Castle Rock, Washington home value: $132,700
Median annual Castle Rock, Washington tax bill: $1,087, $1,313 lower than the national median property tax bill of $2,400.

How are property taxes in Lewis calculated?

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

Last Updated April 13, 2026

Castle Rock, Lewis County, Washington Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

0.79%

Estimate Property Tax Bill

$1,048

$973

How Does the Castle Rock Property Tax Calculator Work?

Use this Castle Rock property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Castle Rock's median effective tax rate of 0.79% — based on actual property records in Lewis County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local appraisal district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Castle Rock'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 Castle Rock: rates range from 0.79% in 98611 to 0.79% in 98611, 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 Castle Rock.

About Castle Rock Property Taxes

About Property Taxes in Castle Rock, Lewis, Washington

Castle Rock's median effective property tax rate of 0.79% is lower than the Washington state median of 0.92% and lower than the national median of 1.02%. This rate reflects the Lewis 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 Castle Rock. Homeowners in the 98611 ZIP code carry a median effective rate of 0.79%, while those in the same ZIP code pay 0.79%. This spread — 0.00 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Lewis County. Understanding which part of Castle Rock you live in can make a meaningful difference to your annual tax bill.

Castle Rock 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 Castle Rock, Lewis 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 Castle Rock'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 Castle Rock, Lewis County, Washington

Source: Ownwell

0.63%

0.76%

0.89%

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 Castle Rock Tax Rate

0.79%

Median Effective Lewis County Tax Rate

0.70%

Median Effective Washington Tax Rate

0.92%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Castle Rock, Lewis County, Washington

Zip	10th Percentile	25th Percentile	Median Tax Rate	75th Percentile	90th Percentile
98611	0.73%	0.78%	0.79%	0.82%	0.83%

Source: Ownwell

Property Tax Assessment Values Across Castle Rock, Lewis County, Washington

When examining property taxes in Castle Rock, 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 Lewis 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 Lewis County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of October.

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 Castle Rock.

For example, the median home price in Castle Rock is $132,700, with tax bills ranging significantly across the county. 98611 has the highest median home price at $132,700.

Property Tax Assessment Values Across Castle Rock, Lewis County, Washington

Source: Ownwell

$112,400

$271,150

$429,900

Median Castle Rock Market Value

$132,700

Median Lewis County Market Value

$329,400

Median Washington Market Value

$501,600

Median United States Market Value

$235,294

Property Tax Assessment Values Across Castle Rock, Lewis County, Washington

Zip	10th Percentile	25th Percentile	Median Home Price	75th Percentile	90th Percentile
98611	$27,000	$61,050	$132,700	$293,625	$352,450

Source: Ownwell

Property Tax Bills Across Castle Rock, Lewis County, Washington

Property tax bills in Castle Rock are based on the assessed value of a home and the local tax rate set for Lewis County. The assessed value is compared with the market value of the property, and the resulting tax bill reflects how much of that value is taxable after local rates are applied. For homeowners, this means a higher assessed value can lead to a larger bill, while a lower assessed value can reduce what is owed.

In Castle Rock, the median home price is $132,700, and the median property tax bill is $1,087, which is below the national median property tax bill of $2,400 and the national median property tax rate of 1.02%. Tax bills can still vary widely, with the 25th percentile at $486 and the 75th percentile at $2,391. For some homeowners, that difference can have a meaningful impact on monthly budgets and long-term housing costs.

Property Tax Bills Across Castle Rock, Lewis County, Washington

Source: Ownwell

$846

$2,280

$3,713

Median Castle Rock Tax Bill

$1,087

Median Lewis County Tax Bill

$2,244

Median Washington Tax Bill

$4,512

Median United States Tax Bill

$2,400

Property Tax Bills Across Castle Rock, Lewis County, Washington

Zip	10th Percentile	25th Percentile	Median Tax Bill	75th Percentile	90th Percentile
98611	$234	$486	$1,087	$2,391	$2,926

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
Lewis Tax Assessor
Website	parcels.lewiscountywa.gov

Frequently Asked Property Tax Questions in Castle Rock, Washington

How are property taxes calculated in Castle Rock, Washington?

Property taxes in Castle Rock, 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 Castle Rock, Washington?

To appeal your property taxes in Castle Rock, 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 Castle Rock, Washington?

Common property tax exemptions in Castle Rock, 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 Castle Rock, Washington?

Property tax deadlines in Castle Rock, 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 Castle Rock, Washington?

Ownwell provides professional property tax appeal services in Castle Rock, 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.