Carterville, Williamson County, Illinois Property Taxes

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Property Taxes in Carterville, Illinois

Median Carterville, Illinois effective property tax rate: 2.25%, significantly lower than the national median of 1.02%, and lower than the Illinois state median of 2.33%.
Median Carterville, Illinois home value: $139,650
Median annual Carterville, Illinois tax bill: $2,946, higher than the national median property tax bill of $2,400.

How are property taxes in Williamson County calculated?

Property taxes in Carterville, 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 Carterville's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Carterville, knowing local tax details benefits homeowners and investors.

Last Updated April 13, 2026

Carterville, Williamson County, Illinois Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

2.25%

Estimate Property Tax Bill

$3,142

$2,916

How Does the Carterville Property Tax Calculator Work?

Use this Carterville property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Carterville's median effective tax rate of 2.25% — based on actual property records in Williamson County — to generate your estimate.

Enter your property's estimated assessed value — the figure the local appraisal district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Carterville'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 Carterville: rates range from 2.25% in 62918 to 2.25% in 62918, 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 Carterville.

About Carterville Property Taxes

About Property Taxes in Carterville, Williamson, Illinois

Carterville’s median effective property tax rate of 2.25% is lower than the Illinois state median of 2.33% and higher than the national median of 1.02%. This rate reflects the Williamson 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 Carterville. Homeowners in the 62918 ZIP code carry a median effective rate of 2.25%, while those in the same ZIP also pay 2.25%. This reflects how school district boundaries and local assessment districts are drawn across Williamson County. Understanding which part of Carterville you live in can make a meaningful difference to your annual tax bill.

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

If your estimated bill 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 Carterville, Williamson 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 Carterville'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 Carterville, Williamson County, Illinois

Source: Ownwell

1.86%

2.24%

2.62%

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 Carterville Tax Rate

2.25%

Median Effective Williamson County Tax Rate

2.31%

Median Effective Illinois Tax Rate

2.33%

Median Effective United States Tax Rate

1.02%

Property Tax Rates Across Carterville, Williamson County, Illinois

Zip	10th Percentile	25th Percentile	Median Tax Rate	75th Percentile	90th Percentile
62918	1.53%	2.02%	2.25%	2.42%	2.52%

Source: Ownwell

Property Tax Assessment Values Across Carterville, Williamson County, Illinois

When examining property taxes in Carterville, 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 Williamson 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 Williamson 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 Carterville.

For example, the median home price in Carterville is $139,650, with tax bills ranging significantly across the county. 62918 has the highest median home price at $139,650.

Property Tax Assessment Values Across Carterville, Williamson County, Illinois

Source: Ownwell

$28,710

$84,180

$139,650

Median Carterville Market Value

$139,650

Median Williamson County Market Value

$92,430

Median Illinois Market Value

$227,888

Median United States Market Value

$235,294

Property Tax Assessment Values Across Carterville, Williamson County, Illinois

Zip	10th Percentile	25th Percentile	Median Home Price	75th Percentile	90th Percentile
62918	$38,676	$78,390	$139,650	$221,670	$311,046

Source: Ownwell

Property Tax Bills Across Carterville, Williamson County, Illinois

Property tax bills in Carterville are based on the assessed value of a home and the local tax rate set by taxing authorities in Williamson County. The assessed value is influenced by the market value of the property, while exemptions and local levies can also affect the final bill.

With a median home price of $139,650, homeowners in Carterville face property tax bills that can vary widely depending on the property and location. The median tax bill is $2,946, which is above the national median property tax bill of $2,400. Bills at the 25th percentile are $1,546, while the 75th percentile reaches $5,019 and the 90th percentile climbs to $7,192.

For homeowners, this means property taxes can be a major part of annual housing costs, especially when assessed values rise faster than income or local tax rates increase.

Property Tax Bills Across Carterville, Williamson County, Illinois

Source: Ownwell

$380

$1,663

$2,946

Median Carterville Tax Bill

$2,946

Median Williamson County Tax Bill

$1,966

Median Illinois Tax Bill

$5,277

Median United States Tax Bill

$2,400

Property Tax Bills Across Carterville, Williamson County, Illinois

Zip	10th Percentile	25th Percentile	Median Tax Bill	75th Percentile	90th Percentile
62918	$657	$1,546	$2,946	$5,019	$7,192

Source: Ownwell

Don't miss the deadline to appeal!

Dates
Appeal Deadline	July 1

Links
Williamson Tax Assessor
Website	williamsonil.devnetwedge.com

Frequently Asked Property Tax Questions in Carterville, Illinois

How are property taxes calculated in Carterville, Illinois?

Property taxes in Carterville, 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 Carterville, Illinois?

To appeal your property taxes in Carterville, 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 Carterville, Illinois?

Common property tax exemptions in Carterville, 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 Carterville, Illinois?

Property tax deadlines in Carterville, 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 Carterville, Illinois?

Ownwell provides professional property tax appeal services in Carterville, 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.