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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Warren County, Illinois

Warren County has an effective property tax rate of 1.81%. On the median home value of $105,000, that's roughly $1,903 per year. Median household income is $67,385.

Effective Property Tax Rate1
1.81%
median tax $1,903 ÷ median home $105,000
Median Home Value1
$105,000
owner-occupied
Median Household Income1
$67,385
per-capita $35,164
Est. Annual Tax on Median Home1
$1,903
at 1.81% 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.

MetricWarren CountyIllinois (state context)
Effective property tax rate11.81%1.80%
Median home value1$105,000—
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 Warren County, IL

Warren County's effective property tax rate of 1.812% sits just above Illinois's statewide median of 1.804%, placing it 48th among the state's 102 counties — essentially middle of the pack within a state known for high property taxes. Homeowners around Berwick and the county's other communities face a median annual real-estate tax bill of $1,903 on a median home value of $105,000, set against a median household income of $67,385 and per-capita income of $35,164. The sharper contrast comes nationally: the U.S. median effective rate is 0.794%, meaning Warren County property owners pay proportionally more than twice what the average American does. That gap signals a real constraint on household budgets here, since property taxes take a larger bite relative to income than in most of the country, even though the county's rate barely differs from Illinois norms.

Frequently asked questions

What is the property tax rate in Warren County, IL?
The effective rate is 1.81% — meaning the median tax bill equals about 1.81% of the median home value.
How much are property taxes on a median home?
On the median home ($105,000), the estimated annual bill is about $1,903.
Is Warren 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 Warren 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 Warren 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.