Boulder, Clinton County, Illinois Property Taxes

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Property Taxes in Boulder, Illinois

Median Boulder, Illinois effective property tax rate: 2.07%, significantly lower than the national median of 1.02%, and lower than the Illinois state median of 2.33%.
Median Boulder, Illinois home value: $38,940
Median annual Boulder, Illinois tax bill: $1,328, lower by $1,072 than the national median property tax bill of $2,400.

How are property taxes in Clinton calculated?

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

Last Updated April 13, 2026

Boulder, Clinton County, Illinois Property Tax Bill Calculator

Property Assessed Value

$100,000

$1,500,000

$3,000,000

Median Effective Tax Rate

2.07%

Estimate Property Tax Bill

$806

$748

How Does the Boulder Property Tax Calculator Work?

Use this Boulder property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Boulder’s median effective tax rate of 2.07% — based on actual property records in Clinton 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 Boulder’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 Boulder: rates range from 2.07% in Boulder to 2.07% in Boulder, 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 Boulder.

About Boulder Property Taxes

About Property Taxes in Boulder, Clinton, Illinois

Boulder’s median effective property tax rate of 2.07% is lower than the Illinois state median of 2.33% and higher than the national median of 1.02%. This rate reflects the Clinton 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 Boulder. Homeowners in different parts of the city can face different tax burdens because school district boundaries and local assessment districts are drawn across Clinton County. Understanding where you live can make a meaningful difference to your annual tax bill.

Boulder 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 Boulder, Clinton 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 Boulder'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 Boulder, Clinton County, Illinois

Source: Ownwell

1.78%

2.04%

2.30%

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 Boulder Tax Rate

2.07%

Median Effective Clinton County Tax Rate

2.02%

Median Effective Illinois Tax Rate

2.33%

Median Effective United States Tax Rate

1.27%

Property Tax Rates Across Boulder, Clinton County, Illinois

Zip	10th Percentile	25th Percentile	Median Tax Rate	75th Percentile	90th Percentile
62231	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Property Tax Assessment Values Across Boulder, Clinton County, Illinois

When examining property taxes in Boulder, 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 Clinton 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 Clinton 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 Boulder.

For example, the median home price in Boulder is $38,940, with tax bills ranging significantly across the county. The median tax bill is $1,328, compared with the national median property tax bill of $2,400 and the national median property tax rate of 1.02%.

Property Tax Assessment Values Across Boulder, Clinton County, Illinois

Source: Ownwell

$56,910

$143,183

$229,455

Median Boulder Market Value

$38,940

Median Clinton County Market Value

$152,625

Median Illinois Market Value

$227,888

Median United States Market Value

$274,101

Property Tax Assessment Values Across Boulder, Clinton County, Illinois

Zip	10th Percentile	25th Percentile	Median Home Price	75th Percentile	90th Percentile
62231	N/A	N/A	N/A	N/A	N/A

Source: Ownwell

Property Tax Bills Across Boulder, Clinton County, Illinois

How Are Property Tax Bills Calculated in Boulder, Clinton County, Illinois?

Property tax bills in Boulder are based on the assessed value of a home, which is then multiplied by the local tax rate set by taxing authorities in Clinton County and other local districts. The assessed value is meant to reflect the market value of the property, and the final bill can also be affected by exemptions, local levies, and changes in school, county, and municipal budgets. For homeowners, this means that two similar homes can still receive different tax bills if their assessments or applicable tax rates differ.

With a median home price of $38,940, property taxes can represent a meaningful part of homeownership costs. In Boulder, the 25th percentile tax bill is $437, the 75th percentile is $1,751, and the 90th percentile is $2,851. These amounts show how much tax bills can vary depending on the home’s assessed value and the local rates applied.

Property Tax Bills Across Boulder, Clinton County, Illinois

Source: Ownwell

$1,024

$2,791

$4,558

Median Boulder Tax Bill

$1,328

Median Clinton County Tax Bill

$2,950

Median Illinois Tax Bill

$5,277

Median United States Tax Bill

$3,209

Property Tax Bills Across Boulder, Clinton County, Illinois

Zip	10th Percentile	25th Percentile	Median Tax Bill	75th Percentile	90th Percentile
62231	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
Clinton Tax Assessor
Website	il1206.cichosting.com

Frequently Asked Property Tax Questions in Boulder, Illinois

How are property taxes calculated in Boulder, Illinois?

Property taxes in Boulder, 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 Boulder, Illinois?

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

Common property tax exemptions in Boulder, 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 Boulder, Illinois?

Property tax deadlines in Boulder, 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 Boulder, Illinois?

Ownwell provides professional property tax appeal services in Boulder, 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.