Property Taxes in Rock Island, Washington
Median Rock Island, Washington effective property tax rate: 0.82%, significantly lower than the national median of 1.02%, and lower than the Washington state median of 0.92%.
Median Rock Island, Washington home value: $285,200
Median annual Rock Island, Washington tax bill: $2,347, $53 lower than the national median property tax bill of $2,400.
How are property taxes in Douglas calculated?
Property taxes in Rock Island, 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 Rock Island's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Rock Island, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
How Does the Rock Island Property Tax Calculator Work?
Use this Rock Island property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Rock Island's median effective tax rate of 0.82% — based on actual property records in Douglas 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 Rock Island'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 Rock Island: rates range from 0.82% in 98850 to 0.82% in 98850, 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 Rock Island.
About Rock Island Property Taxes
About Property Taxes in Rock Island, Douglas, Washington
Rock Island’s median effective property tax rate of 0.82% is lower than the Washington state median of 0.92% and lower than the national median of 1.02%. This rate reflects the Douglas 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 Rock Island. Homeowners in the 98850 ZIP code carry a median effective rate of 0.82%, while those in the 98850 pay 0.82%. Understanding which part of Rock Island you live in can make a meaningful difference to your annual tax bill.
Rock Island 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 Rock Island, Douglas 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 Rock Island'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 Rock Island Tax Rate
0.82%
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 Douglas County Tax Rate
0.87%
Median Effective Washington Tax Rate
0.92%
Median Effective United States Tax Rate
1.27%
Property Tax Rates Across Rock Island, Douglas County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 98850 | 0.80% | 0.80% | 0.82% | 0.85% | 0.86% |
Source: Ownwell
Property Tax Assessment Values Across Rock Island, Douglas County, Washington
When examining property taxes in Rock Island, 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 Douglas County 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 Douglas County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of the month when notices are sent.
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 Rock Island.
For example, the median home price in Rock Island is $285,200, with tax bills ranging significantly across the county. 98850 has the highest median home price at $285,200.
Property Tax Assessment Values Across Rock Island, Douglas County, Washington
Source: Ownwell
$16,800
$322,000
$627,200
Median Rock Island Market Value
$285,200
Median Douglas County Market Value
$361,800
Median Washington Market Value
$501,600
Median United States Market Value
$274,101
Property Tax Assessment Values Across Rock Island, Douglas County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 98850 | $66,200 | $185,550 | $285,200 | $391,500 | $640,820 |
Source: Ownwell
Property Tax Bills Across Rock Island, Douglas County, Washington
Property tax bills in Rock Island are based on the assessed value of a home and the local tax rate set by taxing authorities in Douglas County. When a property’s market value changes, the assessed value can change as well, which can raise or lower the tax bill. Homeowners are taxed on that assessed value, not the purchase price alone, so two similar homes can still have different bills depending on location and local levies.
In Rock Island, the median home price is $285,200, and the median property tax bill is $2,347, which is slightly below the national median property tax bill of $2,400. Bills can vary widely, with the 25th percentile at $1,322 and the 75th percentile at $3,322. At the high end, the 90th percentile reaches $5,119, showing how much taxes can affect monthly housing costs for homeowners.
Median Rock Island Tax Bill
$2,347
Median Douglas County Tax Bill
$3,166
Median Washington Tax Bill
$4,512
Median United States Tax Bill
$3,209
Property Tax Bills Across Rock Island, Douglas County, Washington
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 98850 | $380 | $1,322 | $2,347 | $3,322 | $5,119 |
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 | |
|---|---|
| Douglas Tax Assessor | |
| Website | douglaswa-taxsifter.publicaccessnow.com |