Grundy County, Illinois Property Taxes
Property Taxes in Grundy County, Illinois
Median Grundy County effective property tax rate: 2.61%, significantly higher than the national median of 1.02%.
Median Grundy County home value: $179,043
Median annual Grundy County tax bill: $4,909, $2,509 higher than the national median property tax bill of $2,400.
How are property taxes in Grundy County calculated?
Property taxes in Grundy 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.
Understanding your county's property tax system, exemptions, and reduction opportunities can lead to significant savings. Whether you live in Grundy County or another part of Grundy County, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Grundy County, Illinois Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
2.61%
Estimate Property Tax Bill
$4,673
$4,336
How Does the Grundy County Property Tax Calculator Work?
Use this Grundy County property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Grundy County's median effective tax rate of 2.61% to generate your estimate.
Enter your property's estimated assessed value — the figure the assessor assigns 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. Grundy County's median tax rate is higher than the Illinois median tax rate of 2.33% and well above the national median property tax rate of 1.02%. The median property tax bill is $4,909, which is $2,509 higher than the Illinois median and above the national median property tax bill of $2,400.
For a more precise estimate, scroll down to explore city and ZIP code-level tax rate trends across Grundy County.
Property Tax Rates Across Grundy County, Illinois
What Are Effective Property Tax Rates Across Grundy County?
Local government entities set tax rates, which vary widely across Grundy 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 Grundy County's effective property tax rate to other counties in Illinois or the U.S. median of 1.02%.
Grundy County's median effective rate stands at 2.61%, which is higher than the national median of 1.02%. Within Grundy County, the highest rate is found in Dwight at 3.61%, while Wilmington has the lowest at 1.70%.
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 Grundy County Tax Rate
2.61%
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 Grundy County, Illinois
| City | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Braceville | 2.55% | 2.74% | 2.74% | 2.74% | 4.45% |
| Carbon Hill | 2.03% | 2.03% | 2.03% | 2.03% | 2.03% |
| Channahon | 2.79% | 2.79% | 2.79% | 2.79% | 2.79% |
| Coal City | 1.89% | 2.38% | 2.38% | 2.45% | 2.45% |
| Diamond | 1.89% | 1.89% | 1.95% | 1.95% | 1.95% |
| Dwight | 2.41% | 2.81% | 3.61% | 3.86% | 4.13% |
| East Brooklyn | 2.82% | 2.83% | 2.83% | 2.83% | 3.96% |
| Gardner | 2.54% | 2.73% | 2.73% | 3.70% | 4.08% |
| Kinsman | 2.83% | 2.83% | 3.47% | 4.00% | 4.31% |
| Mazon | 2.59% | 3.01% | 3.04% | 3.77% | 4.29% |
| Minooka | 2.67% | 2.67% | 2.67% | 2.67% | 2.67% |
| Morris | 2.33% | 2.42% | 2.61% | 2.62% | 3.34% |
| Newark | 2.78% | 3.10% | 3.31% | 3.44% | 3.72% |
| Reddick | 3.07% | 3.34% | 3.46% | 3.56% | 3.74% |
| Seneca | 2.12% | 2.35% | 2.73% | 3.33% | 3.57% |
| South Wilmington | 2.83% | 2.86% | 2.86% | 2.86% | 2.86% |
| Verona | 2.70% | 2.87% | 3.60% | 4.12% | 4.56% |
| Wilmington | 1.69% | 1.70% | 1.70% | 1.70% | 1.70% |
| Braidwood | N/A | N/A | N/A | N/A | N/A |
| Godley | N/A | N/A | N/A | N/A | N/A |
| Ransom | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Assessment Values Across Grundy County, Illinois
When examining property taxes in Grundy 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 Grundy 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 Grundy 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. 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 Grundy County.
For example, the median tax bill in Grundy County is $4,909, with tax bills ranging significantly across the county. Channahon has the highest median home price at $356,782.
Median Grundy County Market Value
$179,043
Median Illinois Market Value
$227,888
Median United States Market Value
$235,294
Property Tax Assessment Values Across Grundy County, Illinois
| City | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Braceville | $12,264 | $42,489 | $99,075 | $163,632 | $266,559 |
| Carbon Hill | $30,514 | $42,975 | $85,830 | $173,418 | $260,360 |
| Channahon | $184,826 | $245,407 | $356,782 | $503,774 | $1,721,096 |
| Coal City | $68,632 | $129,611 | $183,726 | $297,901 | $432,030 |
| Diamond | $78,311 | $152,769 | $207,681 | $449,176 | $878,104 |
| Dwight | $22,455 | $68,796 | $137,169 | $278,397 | $723,786 |
| East Brooklyn | $15,293 | $19,301 | $25,910 | $54,354 | $169,073 |
| Gardner | $40,965 | $77,409 | $136,218 | $212,884 | $342,879 |
| Kinsman | $15,941 | $46,197 | $90,957 | $175,585 | $277,582 |
| Mazon | $29,370 | $67,684 | $131,960 | $213,020 | $316,751 |
| Minooka | $115,568 | $173,056 | $224,424 | $364,203 | $836,356 |
| Morris | $60,518 | $123,839 | $188,032 | $299,166 | $537,806 |
| Newark | $12,532 | $121,592 | $220,604 | $339,917 | $397,412 |
| Reddick | $26,811 | $49,447 | $103,086 | $197,036 | $239,982 |
| Seneca | $15,454 | $116,875 | $213,770 | $291,972 | $407,332 |
| South Wilmington | $26,301 | $44,460 | $98,460 | $142,367 | $215,195 |
| Verona | $19,198 | $49,828 | $126,020 | $217,408 | $306,076 |
| Wilmington | $123,121 | $203,157 | $248,445 | $328,854 | $459,523 |
| Braidwood | N/A | N/A | N/A | N/A | N/A |
| Godley | N/A | N/A | N/A | N/A | N/A |
| Ransom | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Bills Across Grundy County, Illinois
Property tax bills in Grundy County are based on the assessed value of a home, not its market price alone. Local taxing authorities apply tax rates to that assessed value to determine the final bill, so two homes with similar market values can still owe different amounts if their assessments or taxing districts differ.
With a median home price of $179,043, many homeowners see bills that vary widely across the county. The 25th percentile tax bill is $3,106, while the 75th percentile is $7,918 and the 90th percentile reaches $13,104. That spread shows how location, local levies, and property characteristics can significantly affect what a homeowner pays each year.
For homeowners, the bill can have a major impact on monthly housing costs and long-term affordability. In Grundy County, the difference between the lowest median tax bill in East Brooklyn at $733 and the highest in Channahon at $9,950 highlights how much property taxes can vary even within the same county.
Median Grundy County Tax Bill
$4,909
Median Illinois Tax Bill
$5,277
Median United States Tax Bill
$2,400
Property Tax Bills Across Grundy County, Illinois
| City | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Braceville | $561 | $1,299 | $3,027 | $4,978 | $8,401 |
| Carbon Hill | $686 | $874 | $1,746 | $3,527 | $5,295 |
| Channahon | $5,154 | $6,854 | $9,950 | $14,049 | $47,996 |
| Coal City | $1,689 | $3,031 | $4,369 | $6,816 | $9,893 |
| Diamond | $1,494 | $2,983 | $4,083 | $8,926 | $17,334 |
| Dwight | $1,171 | $2,707 | $4,768 | $9,552 | $24,223 |
| East Brooklyn | $433 | $546 | $733 | $1,471 | $7,148 |
| Gardner | $1,277 | $2,240 | $4,210 | $7,263 | $12,278 |
| Kinsman | $812 | $1,787 | $4,147 | $6,066 | $11,072 |
| Mazon | $1,198 | $2,523 | $4,614 | $7,162 | $10,489 |
| Minooka | $3,750 | $4,861 | $6,298 | $10,719 | $22,379 |
| Morris | $1,868 | $3,398 | $5,037 | $7,995 | $13,630 |
| Newark | $3,454 | $4,822 | $7,408 | $11,859 | $13,102 |
| Reddick | $1,355 | $2,720 | $4,356 | $5,496 | $7,872 |
| Seneca | $2,527 | $3,648 | $6,132 | $7,913 | $10,089 |
| South Wilmington | $752 | $1,271 | $2,814 | $4,069 | $6,126 |
| Verona | $844 | $2,109 | $5,147 | $8,916 | $11,684 |
| Wilmington | $2,299 | $3,660 | $4,568 | $5,911 | $7,809 |
| Braidwood | N/A | N/A | N/A | N/A | N/A |
| Godley | N/A | N/A | N/A | N/A | N/A |
| Ransom | 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 | |
|---|---|
| Grundy Tax Assessor | |
| Website | tax.grundyco.org |