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Oak Brook, Cook County, Illinois Property Taxes

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Property Taxes in Oak Brook, Illinois

  • Median Oak Brook, Illinois effective property tax rate: 1.74%, 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: $445,000

  • Median annual Oak Brook, Illinois tax bill: $8,142, higher than the national median property tax bill of $2,400.

How are property taxes in Cook 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, Cook County, Illinois Property Tax Bill Calculator

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

1.74%

Estimate Property Tax Bill

$7,743

$7,185

SAVE WITH OWNWELL

$774

Average Annual Tax Savings

How Does the Oak Brook Property Tax Calculator Work?

Use this Oak Brook property tax calculator to estimate your annual tax bill. Enter your property's assessed value and our calculator applies Oak Brook's median effective tax rate of 1.74% — based on actual property records in Cook County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local assessment process uses 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 differ across local taxing districts, primarily due to differences in school district levies and local assessment districts.

Oak Brook's median property tax rate is higher than the national median of 1.02%, and the median property tax bill is $8,142, which is $5,742 higher than the national median bill of $2,400.

If your estimate is higher than expected, Ownwell can appeal your Oak Brook assessment — you only pay if we save you money.

About Oak Brook Property Taxes

About Property Taxes in Oak Brook, Cook, Illinois

Oak Brook’s median effective property tax rate of 1.74% is lower than the Illinois state median of 2.33% and higher than the national median of 1.02%. This rate reflects the Cook 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 Oak Brook. Homeowners in the highest ZIP code carry a median effective rate of 1.74%, while those in the lowest pay 1.74%. This spread reflects how school district boundaries and local assessment districts are drawn across Cook 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 Assessor’s Office before the 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, Cook 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.

Property Tax Rates Across Oak Brook, Cook County, Illinois

Source: Ownwell

1.11%

5.02%

8.93%

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

1.74%

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 Cook County Tax Rate

2.14%

Median Effective Illinois Tax Rate

2.33%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Oak Brook, Cook County, Illinois

Zip10th Percentile25th PercentileMedian Tax Rate75th Percentile90th Percentile
60523N/AN/AN/AN/AN/A

Source: Ownwell

Property Tax Assessment Values Across Oak Brook, Cook 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 Cook 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 Cook County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of May.

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 $445,000, with tax bills ranging significantly across the county. The median tax bill is $8,142, compared with the national median property tax bill of $2,400 and national median property tax rate of 1.02%.

Property Tax Assessment Values Across Oak Brook, Cook County, Illinois

Source: Ownwell

$28,470

$625,355

$1,222,240

Median Oak Brook Market Value

$445,000

Median Cook County Market Value

$248,820

Median Illinois Market Value

$227,888

Median United States Market Value

$235,294

Property Tax Assessment Values Across Oak Brook, Cook County, Illinois

Zip10th Percentile25th PercentileMedian Home Price75th Percentile90th Percentile
60523N/AN/AN/AN/AN/A

Source: Ownwell

Property Tax Bills Across Oak Brook, Cook County, Illinois

How are property tax bills calculated in Oak Brook?

Property tax bills in Oak Brook are based on the assessed value of a home, local tax rates, and the taxing districts that serve the property. When a home’s market value rises, its assessed value can increase too, which can lead to a higher bill if the tax rate stays the same. For homeowners, that means a median home price of $445,000 can translate into a significant annual tax burden, especially in a county where bills are often well above the national median property tax bill of $2,400.

What makes the bill change from one homeowner to another? Differences in assessed value, exemptions, and local levies all play a role. In Oak Brook, property tax bills commonly fall between $6,872 and $9,573, with the highest bills reaching $13,022.

Ownwell can help homeowners review their assessment, identify savings opportunities, and appeal an unfair property tax bill to lower what they owe.

Property Tax Bills Across Oak Brook, Cook County, Illinois

Source: Ownwell

$634

$15,281

$29,928

Median Oak Brook Tax Bill

$8,142

Median Cook County Tax Bill

$5,588

Median Illinois Tax Bill

$5,277

Median United States Tax Bill

$2,400

Property Tax Bills Across Oak Brook, Cook County, Illinois

Zip10th Percentile25th PercentileMedian Tax Bill75th Percentile90th Percentile
60523N/AN/AN/AN/AN/A

Source: Ownwell

Don't miss the deadline to appeal!

Frequently Asked Property Tax Questions in Oak Brook, Illinois

How are property taxes calculated in Oak Brook, Illinois?
Property taxes in Oak Brook, 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 Oak Brook, Illinois?
To appeal your property taxes in Oak Brook, 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 Oak Brook, Illinois?
Common property tax exemptions in Oak Brook, 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 Oak Brook, Illinois?
Property tax deadlines in Oak Brook, 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 Oak Brook, Illinois?
Ownwell provides professional property tax appeal services in Oak Brook, 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.