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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Johnson County, Illinois

Johnson County has an effective property tax rate of 1.24%. On the median home value of $160,500, that's roughly $1,992 per year. Median household income is $62,528.

Effective Property Tax Rate1
1.24%
median tax $1,992 ÷ median home $160,500
Median Home Value1
$160,500
owner-occupied
Median Household Income1
$62,528
per-capita $27,765
Est. Annual Tax on Median Home1
$1,992
at 1.24% 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.

MetricJohnson CountyIllinois (state context)
Effective property tax rate11.24%1.80%
Median home value1$160,500—
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 Johnson County, IL

Johnson County's effective property tax rate of 1.241% sits below Illinois's statewide median of 1.804%, a meaningful gap in a state known for steep property taxes. Among Illinois's 102 counties, this one ranks 98th, placing it near the bottom for tax burden. The median home value here is $160,500, which yields a median annual real-estate tax bill of $1,992 — a figure shaped as much by lower home values as by the rate itself. Compared with the national median effective rate of 0.794%, however, Johnson County homeowners still pay proportionally more. Households earn a median of $62,528, with per-capita income at $27,765. Communities like Belknap, Buncombe, and Cypress anchor this rural southern Illinois county, where property taxes land below the state norm but remain above what most American homeowners face.

Frequently asked questions

What is the property tax rate in Johnson County, IL?
The effective rate is 1.24% — meaning the median tax bill equals about 1.24% of the median home value.
How much are property taxes on a median home?
On the median home ($160,500), the estimated annual bill is about $1,992.
Is Johnson 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 Johnson 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 Johnson 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.