Property Taxes in Union, Washington
Median Union, Washington effective property tax rate: 0.72%, significantly lower than the national median of 1.02%, and lower than the Washington state median of 0.92%.
Median Union, Washington home value: $403,155
Median annual Union, Washington tax bill: $2,855, $455 higher than the national median property tax bill of $2,400.
How are property taxes in Mason calculated?
Property taxes in Union, 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 Union's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Union, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
How Does the Union Property Tax Calculator Work?
Use this Union property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Union's median effective tax rate of 0.72% — based on actual property records in Mason 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 Union'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 Union: rates range from 0.72% in 98592 to 0.72% in 98592, 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 Union.
About Union Property Taxes
About Property Taxes in Union, Mason, Washington
Union’s median effective property tax rate of 0.72% is lower than the Washington state median of 0.92% and lower than the national median of 1.02%. This rate reflects the Mason County base levy combined with local school district levies and local improvement districts that can vary by subdivision throughout the city.
Property tax rates are not uniform across Union. Homeowners in the 98592 ZIP code carry a median effective rate of 0.72%, while those in the same ZIP code pay 0.72%. This spread — 0.00 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Mason County. Understanding which part of Union you live in can make a meaningful difference to your annual tax bill.
Union homeowners who believe their assessed value is too high can file a formal appeal with the 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 Union, Mason 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 Union'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 Union Tax Rate
0.72%
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 Mason County Tax Rate
0.83%
Median Effective Washington Tax Rate
0.92%
Median Effective United States Tax Rate
1.27%
Property Tax Rates Across Union, Mason County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 98592 | 0.63% | 0.68% | 0.72% | 0.75% | 0.84% |
Source: Ownwell
Property Tax Assessment Values Across Union, Mason County, Washington
When examining property taxes in Union, 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 Mason 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 Mason County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of September.
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 Union.
For example, the median home price in Union is $403,155, with tax bills ranging significantly across the county. 98592 has the highest median home price at $403,155.
Property Tax Assessment Values Across Union, Mason County, Washington
Source: Ownwell
$138,885
$361,460
$584,035
Median Union Market Value
$403,155
Median Mason County Market Value
$309,355
Median Washington Market Value
$501,600
Median United States Market Value
$274,101
Property Tax Assessment Values Across Union, Mason County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 98592 | $42,611 | $239,008 | $403,155 | $563,635 | $737,464 |
Source: Ownwell
Property Tax Bills Across Union, Mason County, Washington
Property tax bills in Union are calculated from the assessed value of a home and the local tax rate set by taxing authorities. When a property’s assessed value rises, the tax bill can increase as well, even if the homeowner has not made any changes to the home. For Union, the median home price is $403,155, and the median tax bill is $2,855.00, which is above the national median property tax bill of $2,400 and higher than the national median property tax rate of 1.02%.
Several factors shape the final bill, including the home’s assessed market value, local levies, and any exemptions that may apply. In Union, tax bills can vary widely, with the 25th percentile at $1,574 and the 75th percentile at $4,029. At the 90th percentile, bills reach $5,561, showing how much location and valuation can affect what homeowners owe. For many homeowners, this means property taxes can be a major recurring expense that changes over time as assessments and local rates change.
Median Union Tax Bill
$2,855
Median Mason County Tax Bill
$2,628
Median Washington Tax Bill
$4,512
Median United States Tax Bill
$3,209
Property Tax Bills Across Union, Mason County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 98592 | $279 | $1,574 | $2,855 | $4,029 | $5,561 |
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 | |
|---|---|
| Mason Tax Assessor | |
| Website | property.masoncountywa.gov |