Colp, Williamson County, Illinois Property Taxes

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Property Taxes in Colp, Illinois

Median Colp, Illinois effective property tax rate: 2.24%, significantly lower than the national median of 1.02%, and lower than the Illinois state median of 2.33%.
Median Colp, Illinois home value: $28,710
Median annual Colp, Illinois tax bill: $380, lower than the national median property tax bill of $2,400.

How are property taxes in Williamson calculated?

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

Last Updated April 13, 2026

Colp, Williamson County, Illinois Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

2.24%

Estimate Property Tax Bill

$643

$597

How Does the Colp Property Tax Calculator Work?

Use this Colp property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Colp's median effective tax rate of 2.24% — 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 Colp'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 Colp: rates range from 380 in 62921 to 380 in 62921, 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 Colp.

About Colp Property Taxes

About Property Taxes in Colp, Williamson, Illinois

Colp’s median effective property tax rate of 2.24% 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 (SSAs) that vary by subdivision throughout the city.

Property tax rates are not uniform across Colp. Homeowners in the 62921 ZIP code carry a median effective rate of 2.24%, while those in 62921 pay 2.24%. This spread — 0.00 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Williamson County. Understanding which part of Colp you live in can make a meaningful difference to your annual tax bill.

Colp 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 Colp, 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 Colp'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 Colp, 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 Colp Tax Rate

2.24%

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 Colp, Williamson County, Illinois

Zip	10th Percentile	25th Percentile	Median Tax Rate	75th Percentile	90th Percentile
62921	0.68%	1.45%	2.24%	2.28%	2.28%

Source: Ownwell

Property Tax Assessment Values Across Colp, Williamson County, Illinois

When examining property taxes in Colp, 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 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 Williamson 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 Colp.

For example, the median home price in Colp is $28,710, with tax bills ranging significantly across the county. 62921 has the highest median home price at $28,710.

Property Tax Assessment Values Across Colp, Williamson County, Illinois

Source: Ownwell

$28,710

$84,180

$139,650

Median Colp Market Value

$28,710

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 Colp, Williamson County, Illinois

Zip	10th Percentile	25th Percentile	Median Home Price	75th Percentile	90th Percentile
62921	$3,240	$7,470	$28,710	$54,885	$90,132

Source: Ownwell

Property Tax Bills Across Colp, Williamson County, Illinois

Property tax bills in Colp are based on the assessed value of a home, not its market price alone. Local taxing authorities apply the property tax rate to that assessed value to determine the annual bill, so two homes with similar market values can still owe different amounts if their assessments differ.

Several factors affect the final tax bill, including the home’s assessed value, local tax rates, and any exemptions a homeowner may qualify for. The median home price in Colp is $28,710, which helps explain why bills can vary widely across the area. The tax bill at the 25th percentile is $124, while the 75th percentile reaches $976 and the 90th percentile climbs to $1,768.

For homeowners, this means property taxes can be a meaningful part of housing costs even when home values are relatively modest. In Colp, the highest and lowest median tax bill is $380 in zip code 62921, showing how local conditions can shape what residents pay.

Property Tax Bills Across Colp, Williamson County, Illinois

Source: Ownwell

$380

$1,663

$2,946

Median Colp Tax Bill

$380

Median Williamson County Tax Bill

$1,966

Median Illinois Tax Bill

$5,277

Median United States Tax Bill

$2,400

Property Tax Bills Across Colp, Williamson County, Illinois

Zip	10th Percentile	25th Percentile	Median Tax Bill	75th Percentile	90th Percentile
62921	$60	$124	$380	$976	$1,768

Source: Ownwell

Don't miss the deadline to appeal!

Dates
Appeal Deadline	June 1

Links
Williamson Tax Assessor
Website	williamsonil.devnetwedge.com

Frequently Asked Property Tax Questions in Colp, Illinois

How are property taxes calculated in Colp, Illinois?

Property taxes in Colp, 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 Colp, Illinois?

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

Common property tax exemptions in Colp, 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 Colp, Illinois?

Property tax deadlines in Colp, 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 Colp, Illinois?

Ownwell provides professional property tax appeal services in Colp, 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.