Oak Brook, Dupage County, Illinois Property Taxes
Property Taxes in Oak Brook, Illinois
Median Oak Brook, Illinois effective property tax rate: 1.33%, significantly lower than the national median of 1.02%, and lower than the Illinois state median of 2.33%.
Median Oak Brook, Illinois home value: $768,150
Median annual Oak Brook, Illinois tax bill: $11,220, higher than the national median property tax bill of $2,400.
How are property taxes in DuPage calculated?
Property taxes in Oak Brook, 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 Oak Brook's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Oak Brook, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Oak Brook, Dupage County, Illinois Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
1.33%
Estimate Property Tax Bill
$10,216
$9,481
How Does the Oak Brook Property Tax Calculator Work?
Use this Oak Brook property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Oak Brook's median effective tax rate of 1.33% — based on actual property records in DuPage County — to generate your estimate.
Enter your property's estimated assessed value — the figure used to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Oak Brook'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 Oak Brook: rates range from 1.33% in 60523 to 1.33% in 60523, 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 Oak Brook.
About Oak Brook Property Taxes
About Property Taxes in Oak Brook, DuPage, Illinois
Oak Brook’s median effective property tax rate of 1.33% is higher than the Illinois state median of 2.33% and higher than the national median of 1.02%. This rate reflects the DuPage County base levy combined with local school district levies and Special service areas (SSAs) that vary by subdivision throughout the city.
Property tax rates are not uniform across Oak Brook. Homeowners in the 60523 ZIP code carry a median effective rate of 1.33%, while those in 60523 pay 1.33%. This spread — 0 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across DuPage County. Understanding which part of Oak Brook you live in can make a meaningful difference to your annual tax bill.
Oak Brook 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 Oak Brook, Dupage 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 Oak Brook's effective property tax rate to other cities in Illinois and the median property tax rates in Illinois and the U.S.
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 Oak Brook Tax Rate
1.33%
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 Dupage County Tax Rate
2.16%
Median Effective Illinois Tax Rate
2.33%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Oak Brook, Dupage County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 60523 | 1.23% | 1.26% | 1.33% | 1.71% | 1.90% |
| 60521 | N/A | N/A | N/A | N/A | N/A |
| 60522 | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Assessment Values Across Oak Brook, Dupage County, Illinois
When examining property taxes in Oak Brook, 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 DuPage County assessor 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 DuPage County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of the month.
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 Oak Brook.
For example, the median home price in Oak Brook is $768,150, with tax bills ranging significantly across the county. 60523 has the highest median home price at $768,180.
Property Tax Assessment Values Across Oak Brook, Dupage County, Illinois
Source: Ownwell
$70,860
$450,405
$829,950
Median Oak Brook Market Value
$768,150
Median Dupage County Market Value
$340,350
Median Illinois Market Value
$227,888
Median United States Market Value
$235,294
Property Tax Assessment Values Across Oak Brook, Dupage County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 60523 | $320,844 | $504,840 | $768,180 | $1,154,850 | $1,713,360 |
| 60521 | N/A | N/A | N/A | N/A | N/A |
| 60522 | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Bills Across Oak Brook, Dupage County, Illinois
Property tax bills in Oak Brook are based on the assessed value of a home, not its market price alone. Local taxing authorities set tax rates, and the bill is calculated by applying those rates to the property’s assessed value after any exemptions or adjustments. For homeowners, this means the amount owed can change when assessments change, even if the home has not been sold.
With a median home price of $768,150, Oak Brook homeowners face property tax bills that are well above the national median property tax bill of $2,400. The median tax bill in the area is $11,220, and bills can vary widely, with the 25th percentile at $7,153 and the 75th percentile at $16,206. At the 90th percentile, the bill reaches $22,984.
Because property taxes are tied to assessed value, homeowners in Oak Brook may see significant differences from one property to another, even within the same city.
Median Oak Brook Tax Bill
$11,220
Median Dupage County Tax Bill
$7,578
Median Illinois Tax Bill
$5,277
Median United States Tax Bill
$2,400
Property Tax Bills Across Oak Brook, Dupage County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 60523 | $4,468 | $7,153 | $11,220 | $16,205 | $22,976 |
| 60521 | N/A | N/A | N/A | N/A | N/A |
| 60522 | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | June 1 |
Links | |
|---|---|
| DuPage Tax Assessor | |
| Website | propertylookup.dupagecounty.gov |