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County tax profile · 2026 · Census ACS + IRS data

Property Tax & Income in Rock Island County, Illinois

Rock Island County has an effective property tax rate of 2.28%. On the median home value of $150,400, that's roughly $3,425 per year. Median household income is $67,159.

Effective Property Tax Rate1
2.28%
median tax $3,425 ÷ median home $150,400
Median Home Value1
$150,400
owner-occupied
Median Household Income1
$67,159
per-capita $36,842
Est. Annual Tax on Median Home1
$3,425
at 2.28% 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.

MetricRock Island CountyIllinois (state context)
Effective property tax rate12.28%1.80%
Median home value1$150,400—
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 Rock Island County, IL

Buying in Rock Island County means weighing a below-average purchase price against an above-average tax rate. Homes here run about $150,400 at the median, and the annual property tax bill on such a home comes to roughly $3,425. That works out to an effective rate of 2.277%, steeper than Illinois's 1.804% median and far above the national figure of 0.794%. Among the state's 102 counties, only six carry a heavier rate. Rock Island, the county's largest city, sits within this taxing landscape. Households earn a median of $67,159, with per-capita income at $36,842, so the tax bill absorbs a meaningful share of yearly earnings. For a buyer, the tradeoff is clear: lower sticker prices in communities like Rock Island, Andalusia, and Barstow come paired with one of Illinois's more demanding property tax loads.

Frequently asked questions

What is the property tax rate in Rock Island County, IL?
The effective rate is 2.28% — meaning the median tax bill equals about 2.28% of the median home value.
How much are property taxes on a median home?
On the median home ($150,400), the estimated annual bill is about $3,425.
Is Rock Island 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 Rock Island 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 Rock Island 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.