Property tax in Island County, Washington
The median property tax bill in Island County, Washington is $3,999 a year, which is about 0.67% of the county's median home value of $593,300. That effective rate is lower than the typical Washington county (0.73%) and lower than the national median (0.81%). These are American Community Survey 5-year estimates (2024); your own bill depends on your home's assessed value and any exemptions.
Estimate the property tax on a home in Island County
Enter a home's market value for a ballpark at Island County's average effective rate of 0.67% (Census). The real bill depends on the home's assessed value, the millage where it sits and any exemptions.
Estimated property tax: $3,975 / year
Property tax in Island County at a glance
| Measure | Value |
|---|---|
| Median annual property tax | $3,999 |
| Median home value | $593,300 |
| Effective tax rate | 0.67% |
| Typical Washington county rate | 0.73% |
| National median county rate | 0.81% |
Effective rate = median real estate taxes paid divided by median home value. Source: U.S. Census Bureau, American Community Survey 5-year estimates.
How does Island County compare in Washington?
Among Washington's 39 counties, Island County has the 29th highest effective property-tax rate: 28 rank higher and 10 rank lower. That is on the lower side for Washington. Nationally, it ranks 2014th of 3135 US counties by effective rate. See every Washington county ranked.
How much do homeowners in Island County actually pay?
The median is only the middle bill. Across Island County's 26,888 owner-occupied homes, 69% pay $3,000 or more a year in property tax, 85.4% pay at least $2,000, and 4.7% pay under $800. Another 2% report paying no property tax at all, which usually means an exemption covers the whole bill.
| Annual bill | Homes | Share |
|---|---|---|
| Under $800 | 1,258 | 4.7% |
| $800 to $1,499 | 1,015 | 3.8% |
| $1,500 to $1,999 | 1,117 | 4.2% |
| $2,000 to $2,999 | 4,405 | 16.4% |
| $3,000 or more | 18,545 | 69% |
| No property tax paid | 548 | 2% |
Owners with a mortgage pay a median of $3,918 and owners without one pay $4,138. That is within 10% either way, so in Island County paying off the house does not go with a noticeably different bill. Census table B25103.
How does the Island County property tax bill compare with local incomes?
The median property tax bill of $3,999 is about 3.9% of the median income of Island County homeowner households, $102,975 a year. That compares two middles, so a retiree in a long-held home can pay a far larger share. 74.7% of Island County's occupied homes are lived in by their owners; renters pay property tax too, just folded into rent.
Have property taxes gone up in Island County?
Yes. The median bill went from $2,877 in 2015-2019 to $3,999 in 2020-2024, a 39% rise. Over the same span the median home value moved 65.4%, from $358,800 to $593,300. Bills rose more slowly than values, which is what assessment caps and falling millage rates do: the county is taxing a smaller share of each home's worth.
Two Census ACS 5-year periods with no survey years in common, in each period's own dollars. A change counts only if it exceeds the combined 90% margin of error.
Property tax in counties next to Island County
Island County borders 5 counties.
| County | Effective rate | Median bill | Median home value |
|---|---|---|---|
| Skagit County, WA | 0.79% | $4,308 | $545,100 |
| Kitsap County, WA | 0.77% | $4,279 | $555,100 |
| Snohomish County, WA | 0.77% | $5,364 | $696,000 |
| Jefferson County, WA | 0.71% | $3,818 | $535,000 |
| Island County, WA (this county) | 0.67% | $3,999 | $593,300 |
| San Juan County, WA | 0.53% | $4,253 | $799,200 |
How is a home assessed in Island County?
Washington assesses homes at 100% of market value in every county, Island County included. How Washington assesses and reappraises homes.
Is there a homestead exemption in Island County?
No. Washington has no general homestead exemption; the broad protection is the 1% limit on how much a taxing district's regular levy can grow each year without voter approval. That is the Washington rule, and it applies in Island County. Washington's exemptions and relief programs in full.
When are property taxes due in Island County?
Two installments: the first half by April 30 and the second by October 31 if the total is over $50. Smaller bills are due in full by April 30. The county treasurer bills and collects.
Washington splits the bill into 2 installments. That is the Washington rule. Island County issues and collects the bill, so the dates printed on your statement are the ones that bind you.
How to appeal your Island County property assessment
You contest the assessed value with the County Board of Equalization, then the Washington Board of Tax Appeals. The filing deadline is typically July 1, or 30 to 60 days after your value notice, whichever is later. That is the Washington rule; Island County sets the exact dates and forms. The Washington appeal process step by step.
Washington rules from primary state sources, reviewed September 7, 2026; sources on the Washington page.
Work out your own numbers
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How much house can I afford?
Your income, debts and down payment against the 28/36 rule lenders actually use, with Island County's tax rate to hand.
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Mortgage calculator
Monthly payment with principal, interest, tax and insurance, plus what an extra payment saves you.
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Washington income tax
Brackets, standard deduction and what Washington actually taxes.
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Sales tax in Island County
The other local tax: combined state and local rate for this county.
Sources
- Median real estate taxes paid and median home value for Island County, Washington: U.S. Census Bureau, American Community Survey 5-year estimates (2020-2024), tables B25103, B25077, B25102, B25119 and B25003; the five-year comparison uses the 2015-2019 estimates. Neighboring counties: Census county adjacency file.