Property tax in Clinton County, Illinois
In Clinton County, the property tax bill comes from the Clinton County Treasurer. The 2025 payable 2026 bill is paid in 2 installments, and the next one is due October 28, 2026. You can look up and pay the bill on the county's own payment page. Taken from Clinton County's own pages, checked September 23, 2026.
The median property tax bill in Clinton County, Illinois is $3,524 a year, which is about 1.83% of the county's median home value of $192,400. That effective rate is higher than the typical Illinois county (1.81%) and higher than the national median (0.81%). These are American Community Survey 5-year estimates (2024); your own bill depends on your home's assessed value and any exemptions.
Who sends the property tax bill in Clinton County, and how do you pay it?
The bill comes from the Clinton County Treasurer. The value it is based on is set by a separate office, the Clinton County Supervisor of Assessments (Chief County Assessment Office), with the township assessors, which is who to ask if the value looks wrong. For how to look up and pay the bill, go to the county's own payment information.
Township assessors value homes, and the county suggests talking with the assessment office before filing a complaint. A Board of Review decision can be appealed to the Illinois Property Tax Appeal Board within 30 days of the board's written decision. One county bill carries the taxes of every local district the property sits in, such as schools, the city or village, the township and fire or library districts. Online payment of real estate tax goes through an outside payment service that adds a surcharge. Payments can also be mailed with the bill stub to the Clinton County Treasurer, P.O. Box 174, Carlyle, IL 62231-0174, or made at the Treasurer's office or at local banks. Bills can be received electronically by registering with the code printed on the tax statement.
When are property taxes due in Clinton County?
For the 2025 payable 2026 bill, Clinton County splits the bill into 2 payments, the first due September 16, 2026 and the last October 28, 2026. The next one due is the second installment, on October 28, 2026. Illinois law adds interest of 1.5% a month to each installment paid late. Taxes still unpaid are published and offered at the county's annual tax sale, set for Monday, December 28, 2026, where buyers bid the interest rate they will charge, starting at 9%. An owner whose taxes are sold then has at least two years (two and a half for a home of one to six units) to pay them off through the County Clerk by cash, cashier's check, certified check or money order.
| Payment | Due | Note |
|---|---|---|
| First installment | September 16, 2026 (passed) | Bills were mailed August 14, 2026. |
| Second installment | October 28, 2026 |
From Clinton County's published schedule, checked September 23, 2026. If a date falls on a weekend or holiday, the county's own rules on the next business day apply.
Estimate the property tax on a home in Clinton County
Enter a home's market value for a ballpark at Clinton County's average effective rate of 1.83% (Census). The real bill depends on the home's assessed value, the millage where it sits and any exemptions.
Estimated property tax: $3,521 / year
Property tax in Clinton County at a glance
| Measure | Value |
|---|---|
| Median annual property tax | $3,524 |
| Median home value | $192,400 |
| Effective tax rate | 1.83% |
| Typical Illinois county rate | 1.81% |
| National median county rate | 0.81% |
Effective rate = median real estate taxes paid divided by median home value. Source: U.S. Census Bureau, American Community Survey 5-year estimates.
How does Clinton County compare in Illinois?
Among Illinois's 102 counties, Clinton County has the 45th highest effective property-tax rate: 44 rank higher and 57 rank lower. That is near the middle for Illinois. Nationally, it ranks 132nd of 3135 US counties by effective rate. See every Illinois county ranked.
How much do homeowners in Clinton County actually pay?
The median is only the middle bill. Across Clinton County's 11,698 owner-occupied homes, 58.2% pay $3,000 or more a year in property tax, 74.4% pay at least $2,000, and 6.6% pay under $800. Another 3.3% report paying no property tax at all, which usually means an exemption covers the whole bill.
| Annual bill | Homes | Share |
|---|---|---|
| Under $800 | 777 | 6.6% |
| $800 to $1,499 | 971 | 8.3% |
| $1,500 to $1,999 | 853 | 7.3% |
| $2,000 to $2,999 | 1,896 | 16.2% |
| $3,000 or more | 6,812 | 58.2% |
| No property tax paid | 389 | 3.3% |
Owners with a mortgage pay a median of $3,816 and owners without one pay $3,076. Owners who have paid off a home have usually held it longer, and in states that cap how fast an existing owner's assessment can rise, long-held homes carry lower assessed values. Census table B25103.
How does the Clinton County property tax bill compare with local incomes?
The median property tax bill of $3,524 is about 3.6% of the median income of Clinton County homeowner households, $97,565 a year. That compares two middles, so a retiree in a long-held home can pay a far larger share. 80.3% of Clinton County's occupied homes are lived in by their owners; renters pay property tax too, just folded into rent.
Have property taxes gone up in Clinton County?
Yes. The median bill went from $2,912 in 2015-2019 to $3,524 in 2020-2024, a 21% rise. Over the same span the median home value moved 31.6%, from $146,200 to $192,400. Bills rose more slowly than values, which is what assessment caps and falling millage rates do: the county is taxing a smaller share of each home's worth.
Two Census ACS 5-year periods with no survey years in common, in each period's own dollars. A change counts only if it exceeds the combined 90% margin of error.
Property tax in counties next to Clinton County
Clinton County borders 6 counties.
| County | Effective rate | Median bill | Median home value |
|---|---|---|---|
| St. Clair County, IL | 2.03% | $3,665 | $180,300 |
| Madison County, IL | 1.92% | $3,319 | $173,000 |
| Bond County, IL | 1.89% | $2,747 | $145,700 |
| Washington County, IL | 1.87% | $2,908 | $155,700 |
| Clinton County, IL (this county) | 1.83% | $3,524 | $192,400 |
| Marion County, IL | 1.71% | $1,759 | $103,000 |
| Fayette County, IL | 1.45% | $1,894 | $130,700 |
How is a home assessed in Clinton County?
Illinois assesses homes at 33.33% of market value in every county, Clinton County included. How Illinois assesses and reappraises homes.
Is there a homestead exemption in Clinton County?
Yes. Illinois's General Homestead Exemption is $6,000 of equalized assessed value in most counties, $8,000 in counties next to Cook, and $10,000 in Cook County. That is the Illinois rule, and it applies in Clinton County. Illinois's exemptions and relief programs in full.
Clinton County does not add relief programs of its own beyond the Illinois ones (checked September 23, 2026).
How to appeal your Clinton County property assessment
In Clinton County you appeal to the Clinton County Board of Review. The deadline: A complaint on the state form (PTAX-230 for a home, PTAX-227 for farmland), with all supporting evidence, must be filed within 30 days after the county publishes the current year's assessments, a window Illinois law sets. A mailed complaint must be postmarked by the deadline; an emailed or faxed complaint counts only if the signed original also arrives by the deadline. Late complaints are not heard. These filing rules come from the Board of Review's 2025 rules, the most recent the county has posted. The county has not posted the 2026 publication date; a notice of an assessment change shows the deadline for that property, and the Supervisor of Assessments, who is clerk of the Board of Review, can give it. How to file. Checked September 23, 2026 against state law, because Clinton County does not restate them on its own pages.
How Illinois's appeal process works, including the next level if the first one turns you down.
Illinois rules from primary state sources, reviewed September 7, 2026; sources on the Illinois page.
Work out your own numbers
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How much house can I afford?
Your income, debts and down payment against the 28/36 rule lenders actually use, with Clinton County's tax rate to hand.
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Mortgage calculator
Monthly payment with principal, interest, tax and insurance, plus what an extra payment saves you.
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Illinois income tax
Brackets, standard deduction and what Illinois actually taxes.
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Sales tax in Clinton County
The other local tax: combined state and local rate for this county.
Sources
- Median real estate taxes paid and median home value for Clinton County, Illinois: U.S. Census Bureau, American Community Survey 5-year estimates (2020-2024), tables B25103, B25077, B25102, B25119 and B25003; the five-year comparison uses the 2015-2019 estimates. Neighboring counties: Census county adjacency file.