St. Clair County property tax
Homeowners in St. Clair County, Illinois typically pay about 2.03% of their home's value in property tax each year — a median bill of $3,665 on a median home value of $180,300.
Typical effective rate
2.03%
higher than 2% of U.S. counties
Median tax paid
$3,665
per year
Median home value
$180,300
In IL
#27
of 102 ranked counties
At a glance
- Effective rate 2.03% — 117% higher than the U.S. median of 0.94%, and 1% higher than the Illinois median of 2.01%.
- With vs. without a mortgage — median tax $4,189 for mortgaged homes, $2,871 for homes owned outright.
- State ranking — 27th highest effective rate of 102 ranked Illinois counties; nationally it sits around the 98th percentile.
Estimate a bill for St. Clair County
Apply this county's typical effective rate (2.03%) to a home value of your choice.
Frequently asked questions
What is the property tax rate in St. Clair County, IL?
The typical effective property-tax rate in St. Clair County is 2.03% of a home's value per year, based on median taxes paid ($3,665) divided by the median home value ($180,300) in the Census ACS 2020–2024 5-year estimates. This is a typical burden for comparison, not a statutory mill rate.
How much is property tax on a typical home in St. Clair County?
The median owner-occupied home in St. Clair County is valued at $180,300, and the median real estate tax paid is $3,665 per year. Homes with a mortgage have a median tax of $4,189, versus $2,871 for homes without one.
How does St. Clair County compare to the rest of Illinois?
St. Clair County's effective rate is 1% higher than the Illinois median, ranking 27th of 102 ranked counties in the state.
Compare nearby Illinois counties
Counties ranked closest to St. Clair County by in-state effective rate. Open the comparison tool or see all Illinois counties.
| In-state | County | Effective rate | Median tax |
|---|---|---|---|
| 24 | DuPage County | 2.05% | $8,007 |
| 25 | Livingston County | 2.04% | $2,908 |
| 26 | Whiteside County | 2.04% | $2,598 |
| 28 | Cass County | 2.02% | $1,958 |
| 29 | Bureau County | 2.01% | $2,548 |
| 30 | Grundy County | 1.99% | $5,420 |
Official data & resources for St. Clair County
- St. Clair County Census profile (data.census.gov) — housing, value and tax figures for this county.
- Table B25103 for St. Clair County — median real estate taxes paid (the source for the tax figures above).
- Table B25077 for St. Clair County — median home value.
- Federal forms & is property tax deductible? — IRS Pub 530, Schedule A and the SALT cap, plus your state tax agency.
Finding your exact bill
Your county or municipal assessor (sometimes called the appraisal district, property appraiser, or tax collector) sets the assessed value and the exact millage that produces your bill. Search for "[county name] [state] assessor" or "property tax" on an official .gov site.
Figures on this page are Census survey medians for the whole county (2020–2024 5-year), not an assessment of any individual property. Rates, exemptions and assessment practices vary by municipality and school district within a county.