Cosmopolis, Grays Harbor County, Washington Property Taxes
Median COSMOPOLIS, WA effective property tax rate: 1.25%, significantly higher than the national median of 1.02%, but lower than the Washington state median of 0.88%.
Median COSMOPOLIS, WA home value: $208,286
Median annual COSMOPOLIS, WA tax bill: $2,437, $37 higher than the national median property tax bill of $2,400.
How are property taxes in Grays Harbor calculated?
Property taxes in COSMOPOLIS, WA 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 COSMOPOLIS’s property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in COSMOPOLIS, knowing local tax details benefits homeowners and investors.
Last Updated March 1, 2025
Cosmopolis, Grays Harbor County, Washington Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
1.25%
Estimate Property Tax Bill
$2,604
$2,416
Ownwell’s COSMOPOLIS Property Tax Bill Calculator empowers homeowners, real estate investors, and potential buyers to estimate their annual property taxes in COSMOPOLIS with just two data points.
By entering your property's estimated assessed value, our calculator applies COSMOPOLIS’s median effective tax rate to accurately estimate your property tax bill. Note that your property's assessed value — determined by your county — reflects any exemptions you may have, ensuring a precise calculation for your property tax obligations.
This insightful tool helps you understand potential tax liabilities and highlights how Ownwell can assist in reducing property taxes in Grays Harbor.
For those interested in more localized information, please scroll down to explore city-level trends!
Property Tax Rates Across Cosmopolis, Grays Harbor County, Washington
Local government entities set tax rates, which can vary widely within a state. 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 Cosmopolis’s effective property tax rate to other cities in Washington and the median property tax rates in Washington and the U.S. Cosmopolis, located in Grays Harbor County, has a median tax rate of 1.25%, aligning with both the highest and lowest rates within the county. This rate is higher than the national median property tax rate of 1.02%, indicating a slightly greater tax burden for homeowners in this region compared to the national average. However, it reflects the local government's need to fund services and infrastructure adequately. Understanding these rates can help property owners make informed decisions about appeals and exemptions, ensuring they are not overpaying on their property taxes.
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 Cosmopolis Tax Rate
1.25%
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 Grays Harbor County Tax Rate
1.12%
Median Effective Washington Tax Rate
0.88%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Cosmopolis, Grays Harbor County, Washington
Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
---|---|---|---|---|---|
98537 | 0.85% | 1.06% | 1.25% | 1.41% | 1.61% |
Source: Ownwell
Property Tax Assessment Values Across Cosmopolis, Grays Harbor County, Washington
When examining property taxes in Cosmopolis, 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 Grays Harbor County Assessor's Office 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.
In Grays Harbor 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 Cosmopolis.
For example, the median home price in Cosmopolis is $208,286, with tax bills ranging significantly across the county. Zip code 98537 has the highest median home price at $208,286.
Property Tax Assessment Values Across Cosmopolis, Grays Harbor County, Washington
Source: Ownwell

$120,190
$274,905
$429,620
Median Cosmopolis Market Value
$208,286
Median Grays Harbor County Market Value
$186,974
Median Washington Market Value
$482,000
Median United States Market Value
$235,294
Property Tax Assessment Values Across Cosmopolis, Grays Harbor County, Washington
Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
---|---|---|---|---|---|
98537 | $86,538 | $141,829 | $208,286 | $270,795 | $327,183 |
Source: Ownwell
Property Tax Bills Across Cosmopolis, Grays Harbor County, Washington
In Cosmopolis, located in Grays Harbor County, WA, property tax bills are determined by multiplying the assessed value of a home by the local tax rate. The assessed value is based on a percentage of the property's market value. Homeowners in Cosmopolis experience a wide range of property tax bills, from the 25th percentile at $1,613 to the 90th percentile at $4,196. The median home price in the area is $208,286, and the median property tax bill is notably higher than the national median of $2,400, reflecting the local tax dynamics.
Higher property tax bills can significantly impact homeowners, affecting monthly budgets and long-term financial planning. This is where Ownwell can make a difference. By providing expert property tax appeal and exemption services, Ownwell helps homeowners potentially lower their tax bills. The team analyzes individual property assessments and identifies opportunities for savings, ensuring homeowners pay only their fair share. Through effective tax management, Ownwell aims to alleviate the financial burden on homeowners, making property ownership more affordable.
Property Tax Bills Across Cosmopolis, Grays Harbor County, Washington
Source: Ownwell

$1,306
$2,851
$4,396
Median Cosmopolis Tax Bill
$2,437
Median Grays Harbor County Tax Bill
$1,990
Median Washington Tax Bill
$4,284
Median United States Tax Bill
$2,400
Property Tax Bills Across Cosmopolis, Grays Harbor County, Washington
Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
---|---|---|---|---|---|
98537 | $692 | $1,613 | $2,437 | $3,393 | $4,196 |
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 | |
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Grays Harbor Tax Assessor | |
Website | graysharborwa-taxsifter.publicaccessnow.com |