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Mercer County, Illinois: property tax rate, home values and income

Effective property tax rate

1.95%

38th highest of 102 counties in Illinois

Median home value

$139,300

42nd highest in Illinois

Median household income

$71,710

30th highest in Illinois

Population

15,619

Census ACS 2023

Sources: US Census Bureau, American Community Survey 5-year estimates · Updated 11/03/2026

In Mercer County, Illinois the effective property tax rate is 1.95%. The median homeowner pays $2,710 a year in real estate taxes on a home with a median value of $139,300. That rate is the 38th highest of the 102 Illinois counties with published data, and the 116th highest of 3,132 counties in the United States.

Property tax in Mercer County

The effective rate is the median real estate tax paid divided by the median home value. The Illinois statewide average is 2.07%, so Mercer County is below it. Applying this county's rate to other home prices gives a rough idea of the yearly bill; actual bills depend on the school district, exemptions and the assessed value.

Home valueEstimated tax per yearPer month
$139,300 (county median)$2,710$226
$200,000$3,900$325
$300,000$5,850$488
$400,000$7,800$650
$500,000$9,750$813

Home values and incomes

The median home value is $139,300 (42nd highest in Illinois, 2183rd highest nationally) and the median household income is $71,710. Homes cost about 1.9 times a typical household's yearly income. Median gross rent is $757 a month. 82.7% of occupied homes are owner-occupied. Homeowners with a mortgage pay a median of $1,281 a year for insurance. For comparison, the Illinois statewide median home value is $295,943.

Counties near Mercer County in the Illinois property tax ranking

CountyEffective rateMedian home value
Bond County1.96%$133,100
Iroquois County1.95%$125,400
Knox County1.95%$104,900
Mercer County1.95%$139,300
Lee County1.92%$155,100
Madison County1.92%$167,900
Jackson County1.91%$125,000

Frequently asked questions

What is the property tax rate in Mercer County, Illinois?

The effective property tax rate is 1.95% of home value per year, the 38th highest of 102 counties in Illinois (Census ACS 2023 5-year estimates).

How much is property tax on a $300,000 home in Mercer County?

At the county's effective rate of 1.95%, about $5,850 a year (roughly $488 a month). Your actual bill depends on the assessed value, your school district and exemptions.

What is the median home value in Mercer County?

The median home value is $139,300 (Census ACS 2023 5-year estimates, owner-occupied homes).

What is the median household income in Mercer County?

The median household income is $71,710 (Census ACS 2023 5-year estimates).