O Fallon, St. Clair County, Illinois Property Taxes

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Property Taxes in O Fallon, Illinois

Median O Fallon, Illinois effective property tax rate: 2.36%, significantly higher than the national median of 1.02%, and higher than the Illinois state median of 2.33%.
Median O Fallon, Illinois home value: $233,163
Median annual O Fallon, Illinois tax bill: $4,978, $2,578 higher than the national median property tax bill of $2,400.

How are property taxes in St. Clair calculated?

Property taxes in O Fallon, Illinois are calculated based on the tax assessed value, which is often lower than the actual market value due to property tax exemptions such as the homestead or senior exemption.

Understanding O Fallon’s property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in O Fallon, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

O Fallon, St. Clair County, Illinois Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

2.36%

Estimate Property Tax Bill

$5,503

$5,106

How Does the O Fallon Property Tax Calculator Work?

Use this O Fallon property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies O Fallon’s median effective tax rate of 2.36% — based on actual property records in St. Clair County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local assessment system uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies O Fallon’s median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.

Your bill may vary by ZIP code within O Fallon: rates range from 2.36% in 62269 to 2.36% in 62269, primarily due to differences in school district levies and local assessment districts.

For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across O Fallon.

About O Fallon Property Taxes

About Property Taxes in O FallOn, St. Clair, Illinois

O FallOn's median effective property tax rate of 2.36% is higher than the Illinois state median of 2.33% and higher than the national median of 1.02%. This rate reflects the St. Clair County base levy combined with local school district levies and special service areas that vary by subdivision throughout the city.

Property tax rates are not uniform across O FallOn. Homeowners in the 62269 ZIP code carry a median effective rate of 2.36%, while those in the same ZIP pay 2.36%. This spread — 0 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across St. Clair County. Understanding which part of O FallOn you live in can make a meaningful difference to your annual tax bill.

O FallOn homeowners who believe their assessed value is too high can file a formal appeal with the local Tax Assessor before the June 1, 2026 deadline each year.

If your estimated bill above seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.

Property Tax Rates Across O Fallon, St. Clair County, Illinois

As noted earlier, local government entities set tax rates, which can vary widely within a state.

Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.

While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.

Below, you can compare O Fallon's effective property tax rate to other cities in Illinois and the median property tax rates in Illinois and the U.S.

Property Tax Rates Across O Fallon, St. Clair County, Illinois

Source: Ownwell

2.14%

4.24%

6.33%

Our median effective property tax rate (tax bill ÷ assessor's market value) accounts for exemptions and deductions, making it more accurate than the general median tax rate, which is the midpoint of statutory rates before adjustments.

Median Effective O Fallon Tax Rate

2.36%

Median Effective St. Clair County Tax Rate

2.51%

Median Effective Illinois Tax Rate

2.33%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across O Fallon, St. Clair County, Illinois

Zip	10th Percentile	25th Percentile	Median Tax Rate	75th Percentile	90th Percentile
62269	1.93%	2.20%	2.36%	2.53%	2.53%

Source: Ownwell

Property Tax Assessment Values Across O Fallon, St. Clair County, Illinois

When examining property taxes in O'Fallon, Illinois, understanding the distinction between "market value" and "assessed value" is crucial.

The market value is what a willing buyer would pay to a willing seller in an open and competitive market, often influenced by location, property condition, and economic market trends. The St. Clair County appraisal district estimates the market value for tax purposes.

The assessed value is the market value minus any applicable exemptions or limits determined by local laws and offerings. The tax assessed value is the figure used to calculate your property taxes or the amount multiplied by your tax rate to get your tax bill.

Assessment notices:

In St. Clair County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of the month when notices are sent.

Each property owner receives an assessment notice that contains both the market value and assessed value, along with an estimate of your property tax bill. By providing insights into how assessed and market values are determined, this section helps property owners navigate their tax responsibilities and understand the valuation processes affecting their property taxes in O'Fallon.

For example, the median home price in O'Fallon is $233,163, with tax bills ranging significantly across the county. 62269 has the highest median home price at $233,163.

Property Tax Assessment Values Across O Fallon, St. Clair County, Illinois

Source: Ownwell

$18,168

$156,686

$295,204

Median O Fallon Market Value

$233,163

Median St. Clair County Market Value

$123,447

Median Illinois Market Value

$227,888

Median United States Market Value

$235,294

Property Tax Assessment Values Across O Fallon, St. Clair County, Illinois

Zip	10th Percentile	25th Percentile	Median Home Price	75th Percentile	90th Percentile
62269	$98,249	$146,853	$233,163	$304,434	$400,546

Source: Ownwell

Property Tax Bills Across O Fallon, St. Clair County, Illinois

Property tax bills in O Fallon are calculated by applying local tax rates to a home’s assessed value, which is based on its market value. The assessed value is then multiplied by the combined rates set by local taxing authorities, including schools, municipalities, and other public services, to determine the final bill. For homeowners, this means a higher market value can lead to a higher tax bill, even if the tax rate stays the same.

In O Fallon, the median home price is $233,163, and the median property tax bill is $4,978 in ZIP code 62269. That is well above the national median property tax bill of $2,400 and the national median property tax rate of 1.02%. Tax bills can vary widely, with the 25th percentile at $3,068 and the 75th percentile at $6,940, showing how much location and assessed value can affect what homeowners owe.

Property Tax Bills Across O Fallon, St. Clair County, Illinois

Source: Ownwell

$608

$3,325

$6,041

Median O Fallon Tax Bill

$4,978

Median St. Clair County Tax Bill

$2,978

Median Illinois Tax Bill

$5,277

Median United States Tax Bill

$2,400

Property Tax Bills Across O Fallon, St. Clair County, Illinois

Zip	10th Percentile	25th Percentile	Median Tax Bill	75th Percentile	90th Percentile
62269	$1,817	$3,068	$4,978	$6,940	$9,272

Source: Ownwell

Don't miss the deadline to appeal!

Dates
Appeal Deadline	July 1

Links
St. Clair Tax Assessor
Website	stclairil.devnetwedge.com

Frequently Asked Property Tax Questions in O Fallon, Illinois

How are property taxes calculated in O Fallon, Illinois?

Property taxes in O Fallon, Illinois are calculated by multiplying your property's assessed value by the applicable tax rate set by local taxing authorities. The assessed value is determined by the county assessor and may differ from your property's market value depending on local assessment ratios and exemptions.

How do I appeal my property taxes in O Fallon, Illinois?

To appeal your property taxes in O Fallon, Illinois, you typically need to file a formal protest or appeal with your local appraisal district or assessor's office by the stated deadline. You'll need evidence such as comparable sales, a recent independent appraisal, or documentation of property condition issues. Ownwell can handle this entire process for you.

What property tax exemptions are available in O Fallon, Illinois?

Common property tax exemptions in O Fallon, Illinois include homestead exemptions for primary residences, senior citizen exemptions, veteran exemptions, and disability exemptions. Exemption amounts and eligibility requirements vary by county. Contact your local appraisal district or check Ownwell for details specific to your property.

When are property taxes due in O Fallon, Illinois?

Property tax deadlines in O Fallon, Illinois vary by county but typically include an assessment notice period in spring or early summer, followed by an appeal deadline, and a tax payment due date in the fall or winter. Check with your county assessor's office for specific dates in your area.

How can Ownwell help reduce my property taxes in O Fallon, Illinois?

Ownwell provides professional property tax appeal services in O Fallon, Illinois. Our team analyzes your assessment, gathers evidence, files all paperwork, and represents you at hearings — all with no upfront cost. You only pay a percentage of your savings if we successfully lower your tax bill.