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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Washington County, Illinois

Washington County has an effective property tax rate of 1.87%. On the median home value of $155,700, that's roughly $2,908 per year. Median household income is $78,224.

Effective Property Tax Rate1
1.87%
median tax $2,908 ÷ median home $155,700
Median Home Value1
$155,700
owner-occupied
Median Household Income1
$78,224
per-capita $40,841
Est. Annual Tax on Median Home1
$2,908
at 1.87% effective rate

What you'll pay, at a glance

Property taxes are the largest local tax most homeowners pay. The effective rate measures the real tax bill as a share of home value — a more useful number than the nominal “mill rate,” because assessment practices vary county to county.

MetricWashington CountyIllinois (state context)
Effective property tax rate11.87%1.80%
Median home value1$155,700—
State income tax3top rate 4.95%top rate 4.95%
State sales tax38.98% combined8.98% combined

How this is calculated

The effective property tax rate is the median real-estate tax bill divided by the median home value — both for owner-occupied homes, from the U.S. Census Bureau's American Community Survey (ACS 5-year estimates)1. Median income is also from the ACS1. Federal and state income-tax figures use IRS2 and Tax Foundation3 data.

About Washington County, IL

For buyers eyeing Washington County, Illinois, the arithmetic of affordability starts with a median home value of $155,700 — well below what many metro-area shoppers pay. Property taxes run at an effective rate of 1.868%, which works out to a median annual bill of $2,908. That rate sits above Illinois's statewide median of 1.804% and ranks 43rd among the state's 102 counties, so taxes here aren't the cheapest in Illinois, though they trail far behind the nation's costliest markets. The national median effective rate is just 0.794%. Households earning the county median of $78,224 would devote roughly 3.7% of income to that tax bill, and per-capita income stands at $40,841. Communities like Okawville, Addieville, and Hoyleton anchor the county, offering small-town living where lower purchase prices can offset the somewhat elevated tax rate.

Frequently asked questions

What is the property tax rate in Washington County, IL?
The effective rate is 1.87% — meaning the median tax bill equals about 1.87% of the median home value.
How much are property taxes on a median home?
On the median home ($155,700), the estimated annual bill is about $2,908.
Is Washington County's rate high or low?
Compare it to the state median of 1.80% and the national average near 1.1%.
How does the effective rate differ from my mill rate?
A mill rate is the nominal levy per $1,000 of assessed value. The effective rate reflects what you actually pay after exemptions and assessments — it's the median tax bill as a share of median home value, so it better predicts your real cost.
Will a reassessment raise my tax bill?
Not necessarily. If your home's assessed value rises, your bill can go up, but only if the mill rate and exemptions stay flat. Contact the Washington County assessor's office to review your current assessment.
Can I appeal my property tax assessment?
Yes. Most counties allow an appeal when you believe the assessed value exceeds the market value. File with the Washington County assessor within the local deadline, typically with comparable sales as evidence.
Sources
[1] U.S. Census Bureau — ACS 5-Year (2023) — Median home value (B25077), median real-estate taxes (B25103), median household income (B19013), per-capita income (B19301).
[2] IRS — Statistics of Income — County income, AGI, and real-estate taxes paid.
[3] Tax Foundation — State income, sales, corporate, and estate/inheritance tax rates.