O'Fallon Property Tax Rate
St. Clair County, Illinois
O'Fallon is located in St. Clair County, Illinois. Homeowners in O'Fallon pay a median of $5,759 per year in property taxes on a home valued at $274,100, resulting in an effective tax rate of 2.10%. This is 3% higher than the St. Clair County average of 2.03%.
2.10%
vs 2.03% county avg
$5,759
Per year
$274,100
2024 estimate
32,139
O'Fallon, IL
How O'Fallon Compares
Cities in St. Clair County
Compare property tax rates for 2 cities in St. Clair County, Illinois.
| City | Annual Tax | Rate |
|---|---|---|
| Belleville | $2,924 | 2.23% |
| O'Fallon | $5,759 | 2.10% |
About Property Taxes in O'Fallon
Property taxes in O'Fallon are collected by St. Clair County. Tax exemptions available to St. Clair County residents — including homestead, senior, and disability exemptions — also apply to homeowners in O'Fallon. For detailed information on available exemptions and the county tax collector, see the St. Clair County property tax page.
Property Tax Calculator
Estimate your annual property tax in O'Fallon
Estimated Annual Property Tax
$6,300
$525/month · Rate: 2.10%
St. Clair County Property Taxes
County-level data, exemptions, historical trends, and tax collector info.
View county details →Illinois Property Taxes
Statewide rates, all 102 counties, and exemptions.
View state details →Think your property tax is too high?
Homeowners save an average of $1,148/year by appealing their assessment.
Learn How to Appeal →Frequently Asked Questions
Data Source: U.S. Census Bureau, 2024 American Community Survey 5-Year Estimates. City-level tax data is derived from Census place-level statistics. Effective tax rates are calculated by dividing median real estate taxes paid by median home value. Actual property tax rates may vary based on local taxing jurisdictions, exemptions, and assessment practices. This information is for general reference only and should not be used as a substitute for professional tax advice.