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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Union County, Illinois

Union County has an effective property tax rate of 1.30%. On the median home value of $131,700, that's roughly $1,712 per year. Median household income is $55,728.

Effective Property Tax Rate1
1.30%
median tax $1,712 ÷ median home $131,700
Median Home Value1
$131,700
owner-occupied
Median Household Income1
$55,728
per-capita $31,657
Est. Annual Tax on Median Home1
$1,712
at 1.30% 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.

MetricUnion CountyIllinois (state context)
Effective property tax rate11.30%1.80%
Median home value1$131,700—
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 Union County, IL

In Union County, Illinois, buying a home costs far less than in many parts of the country, and the tax bill follows suit. The median home value sits at $131,700, with an annual property tax bill around $1,712 based on an effective rate of 1.300%. That rate falls below Illinois's statewide median of 1.804%, and the county ranks 97th out of 102 counties for property tax rate. Compared with the national median of 0.794%, though, homeowners here still pay a higher share of value than the average American. Income levels matter too: median household income is $55,728, and per-capita income is $31,657. Anna, the largest of the county's towns, anchors a housing market where lower purchase prices help offset the tax rate. For buyers weighing affordability, Union County offers entry costs well under state norms.

Frequently asked questions

What is the property tax rate in Union County, IL?
The effective rate is 1.30% — meaning the median tax bill equals about 1.30% of the median home value.
How much are property taxes on a median home?
On the median home ($131,700), the estimated annual bill is about $1,712.
Is Union 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 Union 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 Union 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.