Washington County Property Tax Calculator
In Washington County, the median property tax bill is $1,316 a year on a home worth around $250,300 — an effective rate of 0.53% of value. That is the 19th highest of the 44 counties in Idaho (state average 0.5%). On a $350,000 home that works out to about $1,855/year ($155/month in escrow). Enter your home value below.
$3,850 / year
$320.83/month in escrow · effective rate 1.10% of value
Effective rates are state averages (Tax Foundation / Census ACS). Your local rate, assessment ratio and exemptions vary by county — adjust the rate for an exact bill. How we calculate →
Washington County property tax rate vs the rest of Idaho
Washington County has an effective property tax rate of 0.53% — its median real-estate tax bill ($1,316) as a share of its median home value ($250,300). That is above Idaho's 0.5% state average, and ranks the 19th highest of the 44 counties in Idaho.
Rates are set by local taxing bodies — the county, your city or town, and the school district — so two homes of the same value in different parts of Idaho can owe very different amounts. The calculator above starts from Washington County's 0.53% effective rate; adjust it to your exact municipality or add a homestead exemption for a closer estimate.
Property tax by home value in Washington County
Estimated annual Washington County property tax at its 0.53% effective rate:
$250,000 home → $1,325/yr · $350,000 home → $1,855/yr · $500,000 home → $2,650/yr.
Divide by 12 for the monthly escrow amount your mortgage servicer collects — for example $155/month on a $350,000 home. These figures use the county effective rate; your local rate and any exemptions change the final bill.
How affordable is property tax in Washington County?
The typical Washington County homeowner pays about $1,316 in property tax against a median household income of $53,608 — roughly 2.5% of income a year. That ratio is a quick way to compare the real weight of property tax across counties, since a low rate on an expensive home can still be a large dollar bill.
How Washington County property tax is calculated
Washington County's assessor sets your home's assessed value, and local millage rates from the county, municipality and school district are applied to it; the 0.53% effective rate rolls all of that into one share of market value. To estimate your tax, multiply your home value by 0.53% (or your exact local rate), then subtract any homestead or senior exemption you qualify for. The calculator above does this and shows both the annual bill and the monthly escrow amount.
Washington County property tax — frequently asked questions
What is the property tax rate in Washington County?
Washington County's effective property tax rate is 0.53% of home value in 2026 — its median $1,316 bill on a median $250,300 home. That is the 19th highest of the 44 counties in Idaho, where the state average is 0.5%.
How much is property tax on a $350,000 home in Washington County?
At Washington County's 0.53% effective rate, a $350,000 home owes about $1,855 a year — roughly $155 a month through escrow. Your exact municipality and any exemptions can move this up or down.
Is property tax high in Washington County?
Washington County ranks the 19th highest of the 44 counties in Idaho by effective rate (0.53% vs the 0.5% state average), so it is on the higher side for Idaho. The median bill is $1,316 a year.
What is the median property tax in Washington County?
The median Washington County homeowner pays about $1,316 a year, on a median home value of around $250,300 — an effective rate near 0.53% (US Census ACS).
How is Washington County property tax calculated?
Multiply your home's value by Washington County's effective rate (0.53%, or your exact local millage), then subtract any homestead exemption. The county assessor sets the assessed value and local bodies set the rates; the calculator above estimates the annual and monthly amounts.
Compare nearby counties in Idaho
See all 44 Idaho counties ranked by property tax rate, or compare:
Researched & verified by the Calcuris Data & Research Team. How we build and check our tools →