St. Clair County, Illinois Property Taxes
Property Taxes in St. Clair County, Illinois
Median St. Clair County effective property tax rate: 2.51%, significantly higher than the national median of 1.02%.
Median St. Clair County home value: $123,447
Median annual St. Clair County tax bill: $2,978, $578 higher than the national median property tax bill of $2,400.
How are property taxes in St. Clair County calculated?
Property taxes in St. Clair County 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.
Why are St. Clair County property taxes so high? The county’s effective property tax rate is 2.51%, which is higher than the national median and also higher than the Illinois state median tax rate of 2.33%.
What can lower a property tax bill in St. Clair County? Exemptions and reduction opportunities can help reduce the assessed value and may lead to meaningful savings on the annual tax bill.
Whether you live in St. Clair County or another part of the county, understanding local tax details can help homeowners and investors make smarter decisions.
Last Updated April 13, 2026
St. Clair County, Illinois Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
2.51%
Estimate Property Tax Bill
$3,099
$2,875
How Does the St. Clair County Property Tax Calculator Work?
Use this St. Clair County property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies St. Clair County's median effective tax rate of 2.51% to generate your estimate.
Enter your property's estimated assessed value — the figure used for tax purposes, which is typically lower than market value after applicable exemptions. Our calculator uses the median effective rate for a more accurate estimate than the statutory millage rate alone.
Your actual bill may vary based on your specific exemptions, local school district levies, and any special assessment districts that apply to your property. St. Clair County's median tax rate is higher than Illinois’ 2.33% median rate, and the county’s median tax bill of $2,978 is $578 higher than the state median tax bill of $2,400.
For a more precise estimate, scroll down to explore city and ZIP code-level tax rate trends across St. Clair County.
Property Tax Rates Across St. Clair County, Illinois
What Are Effective Property Tax Rates Across St. Clair County?
Local government entities set tax rates, which vary widely across St. Clair County. Each year, the county estimates its budget for public services and divides that total by the assessed value of all taxable property within its jurisdiction.
Below, compare St. Clair County's effective property tax rate to other counties in Illinois or the U.S. median of 1.02%.
St. Clair County's median effective rate stands at 2.51%, which is higher than the national median of 1.02%. Within St. Clair County, the highest rate is found in East Saint Louis at 4.59%, while Collinsville has the lowest at 2.14%.
These variations reflect differences in local school district levies, Special service areas (SSAs) assessments, and special district bonds — which compound the base county rate.
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 St. Clair County Tax Rate
2.51%
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 Illinois Tax Rate
2.33%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across St. Clair County, Illinois
| City | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Belleville | 1.83% | 2.24% | 2.55% | 2.94% | 3.13% |
| Caseyville | 1.40% | 1.97% | 2.36% | 2.92% | 3.16% |
| Collinsville | 1.43% | 1.92% | 2.14% | 2.33% | 2.59% |
| Columbia | 1.86% | 2.01% | 2.17% | 2.28% | 2.40% |
| Dupo | 1.72% | 2.43% | 2.83% | 3.22% | 3.23% |
| East Carondelet | 1.48% | 2.24% | 2.72% | 2.91% | 3.40% |
| East Saint Louis | 1.61% | 3.30% | 4.59% | 6.33% | 6.33% |
| Fairview Heights | 1.62% | 2.00% | 2.25% | 2.57% | 2.83% |
| Freeburg | 1.95% | 2.33% | 2.53% | 2.66% | 2.83% |
| Lebanon | 1.85% | 2.24% | 2.50% | 2.90% | 2.90% |
| Lenzburg | 1.22% | 1.88% | 2.42% | 2.43% | 2.52% |
| Lovejoy | 2.58% | 4.46% | 4.46% | 4.46% | 4.46% |
| Marissa | 1.29% | 1.96% | 2.43% | 2.70% | 2.70% |
| Mascoutah | 1.80% | 2.19% | 2.38% | 2.59% | 2.59% |
| Millstadt | 1.70% | 2.08% | 2.27% | 2.38% | 2.53% |
| New Athens | 1.59% | 2.04% | 2.30% | 2.50% | 2.72% |
| New Baden | 1.72% | 2.17% | 2.30% | 2.75% | 2.75% |
| O Fallon | 1.93% | 2.20% | 2.36% | 2.53% | 2.53% |
| Saint Libory | 1.71% | 2.13% | 2.50% | 2.84% | 2.84% |
| Shiloh | 2.30% | 2.33% | 2.33% | 2.33% | 2.53% |
| Smithton | 2.03% | 2.37% | 2.55% | 2.63% | 2.82% |
| Summerfield | 1.51% | 2.37% | 2.92% | 2.92% | 2.92% |
| Swansea | 1.85% | 2.23% | 2.47% | 2.70% | 2.85% |
| Trenton | 1.86% | 2.17% | 2.41% | 2.68% | 2.72% |
| Troy | 1.78% | 2.04% | 2.18% | 2.30% | 2.39% |
| Waterloo | 1.59% | 1.92% | 2.15% | 2.42% | 2.60% |
| Alorton | N/A | N/A | N/A | N/A | N/A |
| Cahokia | N/A | N/A | N/A | N/A | N/A |
| Darmstadt | N/A | N/A | N/A | N/A | N/A |
| E St Louis | N/A | N/A | N/A | N/A | N/A |
| Fairmont City | N/A | N/A | N/A | N/A | N/A |
| Fayetteville | N/A | N/A | N/A | N/A | N/A |
| Lebanon | N/A | N/A | N/A | N/A | N/A |
| Mascoutah | N/A | N/A | N/A | N/A | N/A |
| Red Bud | N/A | N/A | N/A | N/A | N/A |
| Scott Air Force Base | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Assessment Values Across St. Clair County, Illinois
When examining property taxes in St. Clair County, 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 St. Clair County assessment office 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 St. Clair 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. For example, the median tax bill in St. Clair County is $2,978, compared with the national median property tax bill of $2,400. Tax bills range significantly across the county, from $608 in Lovejoy to $6,041 in Columbia. Columbia also has the highest median home price at $295,204.
Property Tax Assessment Values Across St. Clair County, Illinois
Source: Ownwell
$18,168
$156,686
$295,204
Median St. Clair County Market Value
$123,447
Median Illinois Market Value
$227,888
Median United States Market Value
$235,294
Property Tax Assessment Values Across St. Clair County, Illinois
| City | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Belleville | $69,882 | $94,720 | $134,456 | $210,999 | $298,025 |
| Caseyville | $27,989 | $59,670 | $101,124 | $172,134 | $362,282 |
| Collinsville | $13,353 | $37,713 | $110,703 | $166,116 | $208,836 |
| Columbia | $76,665 | $190,504 | $295,204 | $392,827 | $525,861 |
| Dupo | $27,729 | $66,657 | $100,512 | $145,984 | $172,714 |
| East Carondelet | $11,865 | $34,168 | $74,541 | $121,137 | $197,217 |
| East Saint Louis | $1,379 | $17,202 | $27,741 | $36,789 | $49,573 |
| Fairview Heights | $69,500 | $100,875 | $135,128 | $197,536 | $256,167 |
| Freeburg | $89,513 | $143,673 | $194,268 | $275,112 | $354,469 |
| Lebanon | $63,031 | $100,472 | $149,679 | $235,898 | $356,242 |
| Lenzburg | $14,501 | $42,664 | $82,839 | $128,626 | $187,134 |
| Lovejoy | $1,319 | $4,062 | $18,168 | $24,410 | $34,825 |
| Marissa | $16,892 | $52,989 | $77,904 | $110,802 | $158,673 |
| Mascoutah | $67,143 | $123,374 | $184,524 | $261,225 | $335,136 |
| Millstadt | $103,209 | $155,996 | $219,338 | $300,074 | $387,064 |
| New Athens | $40,535 | $78,407 | $110,010 | $160,330 | $227,819 |
| New Baden | $76,546 | $86,295 | $96,561 | $151,740 | $244,829 |
| O Fallon | $98,249 | $146,853 | $233,163 | $304,434 | $400,546 |
| Saint Libory | $14,613 | $75,937 | $109,868 | $143,966 | $191,319 |
| Shiloh | $66,987 | $145,632 | $198,045 | $205,874 | $223,496 |
| Smithton | $116,302 | $176,590 | $232,312 | $300,752 | $406,340 |
| Summerfield | $9,456 | $25,071 | $73,512 | $110,564 | $132,900 |
| Swansea | $79,287 | $108,200 | $158,656 | $225,373 | $314,991 |
| Trenton | $72,012 | $111,525 | $166,941 | $240,141 | $314,016 |
| Troy | $120,251 | $139,274 | $193,257 | $239,685 | $338,704 |
| Waterloo | $45,735 | $99,430 | $178,036 | $272,141 | $357,469 |
| Alorton | N/A | N/A | N/A | N/A | N/A |
| Cahokia | N/A | N/A | N/A | N/A | N/A |
| Darmstadt | N/A | N/A | N/A | N/A | N/A |
| E St Louis | N/A | N/A | N/A | N/A | N/A |
| Fairmont City | N/A | N/A | N/A | N/A | N/A |
| Fayetteville | N/A | N/A | N/A | N/A | N/A |
| Lebanon | N/A | N/A | N/A | N/A | N/A |
| Mascoutah | N/A | N/A | N/A | N/A | N/A |
| Red Bud | N/A | N/A | N/A | N/A | N/A |
| Scott Air Force Base | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Bills Across St. Clair County, Illinois
Property tax bills in St. Clair County are based on a home’s assessed value, not its market price alone. Local taxing authorities apply the county’s tax rate to that assessed value to determine the annual bill, and the result can vary widely depending on where a homeowner lives and which local services fund the tax levy.
Several factors shape the final amount, including the home’s value, local tax rates, and any exemptions a homeowner may qualify for. With a median home price of $123,447, bills can still differ sharply across the county. The 25th percentile tax bill is $1,710, while the 75th percentile is $4,933 and the 90th percentile reaches $7,203.
That spread shows how property taxes can affect homeowners unevenly. In Columbia, the highest median tax bill is $6,041, while Lovejoy has the lowest median tax bill at $608. For many homeowners, understanding how the bill is calculated is the first step to anticipating costs and spotting potential savings.
Median St. Clair County Tax Bill
$2,978
Median Illinois Tax Bill
$5,277
Median United States Tax Bill
$2,400
Property Tax Bills Across St. Clair County, Illinois
| City | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Belleville | $1,558 | $2,314 | $3,334 | $4,971 | $7,159 |
| Caseyville | $619 | $1,394 | $2,243 | $3,770 | $8,398 |
| Collinsville | $233 | $765 | $2,179 | $3,410 | $4,468 |
| Columbia | $1,374 | $3,552 | $6,041 | $8,655 | $11,441 |
| Dupo | $640 | $1,526 | $2,665 | $4,014 | $4,923 |
| East Carondelet | $366 | $905 | $1,849 | $2,987 | $4,884 |
| East Saint Louis | $191 | $619 | $1,191 | $1,767 | $2,268 |
| Fairview Heights | $1,300 | $2,150 | $3,014 | $4,464 | $5,764 |
| Freeburg | $1,737 | $3,234 | $4,653 | $6,809 | $8,994 |
| Lebanon | $1,211 | $2,327 | $3,631 | $5,524 | $8,037 |
| Lenzburg | $237 | $748 | $1,597 | $2,661 | $4,092 |
| Lovejoy | $58 | $121 | $608 | $973 | $1,228 |
| Marissa | $342 | $909 | $1,652 | $2,530 | $3,803 |
| Mascoutah | $1,142 | $2,511 | $3,863 | $5,686 | $7,610 |
| Millstadt | $1,735 | $3,224 | $4,745 | $6,684 | $8,641 |
| New Athens | $755 | $1,571 | $2,408 | $3,569 | $5,167 |
| New Baden | $1,526 | $1,924 | $2,451 | $3,323 | $5,139 |
| O Fallon | $1,817 | $3,068 | $4,978 | $6,940 | $9,272 |
| Saint Libory | $367 | $1,457 | $2,532 | $3,536 | $5,027 |
| Shiloh | $1,391 | $3,410 | $4,613 | $4,688 | $5,174 |
| Smithton | $2,483 | $4,076 | $5,789 | $7,445 | $10,059 |
| Summerfield | $275 | $654 | $1,802 | $2,739 | $3,517 |
| Swansea | $1,643 | $2,411 | $3,730 | $5,387 | $7,680 |
| Trenton | $1,109 | $2,503 | $3,958 | $5,570 | $7,784 |
| Troy | $1,864 | $2,770 | $3,877 | $4,897 | $6,799 |
| Waterloo | $852 | $1,911 | $3,400 | $5,673 | $7,588 |
| Alorton | N/A | N/A | N/A | N/A | N/A |
| Cahokia | N/A | N/A | N/A | N/A | N/A |
| Darmstadt | N/A | N/A | N/A | N/A | N/A |
| E St Louis | N/A | N/A | N/A | N/A | N/A |
| Fairmont City | N/A | N/A | N/A | N/A | N/A |
| Fayetteville | N/A | N/A | N/A | N/A | N/A |
| Lebanon | N/A | N/A | N/A | N/A | N/A |
| Mascoutah | N/A | N/A | N/A | N/A | N/A |
| Red Bud | N/A | N/A | N/A | N/A | N/A |
| Scott Air Force Base | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | July 1 |
Links | |
|---|---|
| St. Clair Tax Assessor | |
| Website | stclairil.devnetwedge.com |