Property Tax in St. Clair County, Illinois
In St. Clair County, Illinois, the typical homeowner pays $3,533 a year in property taxes on a home worth a median of $168,800. The figures on this page are the Census Bureau's published medians (US Census Bureau, American Community Survey (ACS) 5-year estimates, 2023), shown exactly as released.
What the St. Clair County numbers mean
Read the two medians together: $3,533 is the middle tax bill among owner-occupied households in St. Clair County, and $168,800 is the middle home value. Neither figure describes a specific property — together they describe the typical homeowner's situation in the county.
The derived effective rate for St. Clair County is 2.09% (median tax ÷ median value). Treat it as an estimate for comparison only: it comes from survey medians of different households, not from the county's rate schedule.
The key figures for St. Clair County
| Measure | St. Clair County |
|---|---|
| Median real estate taxes paid per year | $3,533 |
| Median home value | $168,800 |
| Derived effective rate* | 2.09% |
| Equivalent monthly tax | $294 |
| Tax per $100,000 of value (derived) | $2,093 |
| Illustrative tax on a $400,000 home (derived rate) | $8,372 |
For context, the Illinois medians are $5,189 of tax on $250,500 of value, and the US medians are $2,969 on $303,400. *Derived figures are estimates from Census medians, not official rates.
St. Clair County at a glance
- Median tax rank in Illinois: #18 of 102 counties
- Median home value rank in Illinois: #24 of 102
- Population rank in Illinois: #9 of 102 (254,777 residents)
- Population density rank: #9 of 102 (387 people per square mile)
- Land area rank in Illinois: #28 of 102 (657 sq mi, 1.2% of the combined county land area)
- Median tax as a monthly figure: $294; per $1,000 of home value: $2.09
How St. Clair County compares
Of the 102 Illinois counties with published data, 17 have a higher median property tax bill than St. Clair County's $3,533, putting the county at #18 in the state. Its bill is about 32% lower than the state median of $5,189 and about 19% higher than the national median of $2,969.
Rates and values pull in opposite directions: an expensive housing market can produce big bills at ordinary rates. Here the derived rate is 2.09%, versus 0.98% derived nationally, and the median home value ranks #24 within Illinois.
Some extra context for St. Clair County: the median bill works out to about $294 a month, and the derived rate equals roughly $2,093 of tax per $100,000 of home value. The county is home to 254,777 people — the #9 most populous county in Illinois, spread over 657 square miles, a density of about 387 people per square mile. Its median home value, $168,800, ranks #24 among the state's 102 counties with data.
Zooming out: of 3133 counties nationwide with published Census figures, only 303 record a higher median tax bill than St. Clair County — it sits in the top 10% nationally. The county holds roughly 2.0% of Illinois's people. Its homes are worth less than the state norm (median $168,800 versus $250,500), and a decade at the derived rate of 2.09% adds up to about 20.93% of the median home's value in tax. The cheapest county in the state, Pulaski County, medians $668 — $2,865 less than St. Clair County per year.
Counties nearest St. Clair County in the Illinois ranking
| County | Median tax paid | Median home value | Derived rate* |
|---|---|---|---|
| Winnebago County, IL | $3,850 | $155,100 | 2.48% |
| Ogle County, IL | $3,737 | $184,100 | 2.03% |
| Tazewell County, IL | $3,481 | $164,500 | 2.12% |
| Peoria County, IL | $3,416 | $152,600 | 2.24% |
How the tax is worked out
The bill is built in stages. First the assessor puts a market value on the property. Exemptions — a homestead exemption above all — then reduce the taxable amount. Finally the combined local rate is applied. To see the scale: at the county's derived rate of 2.09%, each $100,000 of value corresponds to about $2,093 of tax a year, and a $400,000 home to roughly $8,372. Real bills use the official assessment and district rates, not this derived figure, so treat the example as a sense of scale only.
Checking your assessment in St. Clair County
Believe your assessment is too high? The practical order of attack is: obtain your record card and audit it line by line; collect comparable recent sales in St. Clair County; ask the assessor's office to correct anything plainly wrong; and, if the value still seems off, lodge a formal appeal ahead of the deadline printed on your assessment notice. Windows are short — often 30 to 90 days — and late appeals are usually rejected outright, however strong the case.
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Frequently asked questions
What is the median property tax in St. Clair County, Illinois?
The median real estate tax paid in St. Clair County, Illinois is $3,533 per year, on a median home value of $168,800 (US Census Bureau, American Community Survey (ACS) 5-year estimates, 2023).
What is the effective property tax rate in St. Clair County, Illinois?
Dividing St. Clair County's median tax bill ($3,533) by its median home value ($168,800) gives a derived effective rate of 2.09%. This is an estimate computed from two Census survey medians — it is not the county's official tax rate.
How does St. Clair County compare with the rest of Illinois?
By median taxes paid, St. Clair County stands at #18 among the 102 Illinois counties the Census publishes figures for. Its $3,533 median bill is about 32% lower than the state median ($5,189), and 17 counties in the state record a higher median.
How are property taxes calculated in St. Clair County, Illinois?
Three steps produce the bill: an assessment of market value by the local assessor, a reduction for exemptions you qualify for (a homestead exemption is the common one), and multiplication by the combined rates of the county, municipality, school district and any special districts covering the property. The median result in St. Clair County is $3,533 of tax on a $168,800 median home value.
Can I appeal my property tax assessment in St. Clair County, Illinois?
Yes — appeals are handled locally. Start with the St. Clair County assessor's property record card for your home, correct any factual errors, and back your case with comparable recent sales. Formal appeals go to the review board named on your assessment notice and must be filed by its deadline, typically within 30 to 90 days.