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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Adams County, Illinois

Adams County has an effective property tax rate of 1.58%. On the median home value of $162,600, that's roughly $2,573 per year. Median household income is $66,220.

Effective Property Tax Rate1
1.58%
median tax $2,573 ÷ median home $162,600
Median Home Value1
$162,600
owner-occupied
Median Household Income1
$66,220
per-capita $37,595
Est. Annual Tax on Median Home1
$2,573
at 1.58% 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.

MetricAdams CountyIllinois (state context)
Effective property tax rate11.58%1.80%
Median home value1$162,600—
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 Adams County, IL

In Adams County, Illinois, buyers weighing affordability will find a median home value of $162,600 paired with an effective property tax rate of 1.582%. That combination yields a median annual real-estate tax bill of $2,573. The statewide median effective rate is 1.804%, so this county taxes property below Illinois norms, and it ranks 72nd of 102 counties on that measure. Nationally, though, the picture shifts: the U.S. median effective rate is 0.794%, meaning Adams County homeowners pay proportionally more than the average American. Income levels help offset the cost — the median household earns $66,220, and per-capita income is $37,595. Quincy, the county's largest city, anchors the local housing market. For someone drawn to lower purchase prices than many Illinois markets offer, the tax rate here sits below the state average, though it remains above the national one.

Frequently asked questions

What is the property tax rate in Adams County, IL?
The effective rate is 1.58% — meaning the median tax bill equals about 1.58% of the median home value.
How much are property taxes on a median home?
On the median home ($162,600), the estimated annual bill is about $2,573.
Is Adams 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 Adams 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 Adams 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.