Grundy County, IL property tax
Census ACS 2023 5-year estimates · updated 2026-09-20
The median effective property tax rate in Grundy County is 2.03%, below the Illinois median of 2.07% and above the national median of 0.98%. The median homeowner pays $5,260 a year on a home worth $259,200.
- Effective rate
- 2.03%
- Median annual bill
- $5,260
- Median home value
- $259,200
- Rank in Illinois
- 31of 102
Median annual bill divided by median home value, Census ACS 2023 5-year estimates.
Estimated annual bill by home value
| Home value | Estimated bill | Per month |
|---|---|---|
| $200,000 | $4,060 | $338 |
| $300,000 | $6,090 | $507 |
| $400,000 | $8,120 | $677 |
| $500,000 | $10,150 | $846 |
| $750,000 | $15,225 | $1,269 |
| $1,000,000 | $20,300 | $1,692 |
Property tax rates by city in Grundy County, 2024
For tax year 2024, billed in 2025, the average residential tax at each city's rate in Grundy County ran from $3,258 in Diamond (Braceville Twp) to $7,364 in Channahon. Across all property in the county, the average tax rate was 6.80 per $100 of equalized assessed value, down from 6.92 in 2023.
Illinois rates apply to taxable value, not market value, so a rate of 7 means $7 per $100 of taxable value. The effective rate column turns each tax into a share of market value, which is the figure to compare between cities.
| City | Township or road district | Average tax 2024 | Average tax 2023 | Effective rate | Aggregate rate | Average home value |
|---|---|---|---|---|---|---|
| Channahon | Aux Sable Twp | $7,364 | $6,866 | 2.26% | 8.1535 | $325,232 |
| Minooka | Aux Sable Twp | $7,071 | $6,580 | 2.17% | 7.8287 | $325,232 |
| Morris | Saratoga Twp (Grundy) | $5,595 | $5,311 | 1.86% | 8.0928 | $301,002 |
| Gardner | Braceville Twp | $4,629 | $4,312 | 2.03% | 7.7962 | $228,165 |
| Verona | Vienna Twp (Grundy) | $4,547 | $4,276 | 1.99% | 7.7406 | $228,554 |
| Braceville | Braceville Twp | $4,495 | $4,364 | 1.97% | 7.5711 | $228,165 |
| Carbon Hill | Felix Twp | $4,438 | $4,270 | 1.44% | 5.7602 | $308,212 |
| Diamond | Felix Twp | $4,392 | $4,148 | 1.42% | 5.7002 | $308,212 |
| Mazon | Mazon Twp | $4,196 | $3,885 | 1.97% | 8.2129 | $213,066 |
| Coal City | Braceville Twp | $4,079 | $3,852 | 1.79% | 6.8710 | $228,165 |
| Morris | Morris Twp | $4,040 | $3,804 | 1.68% | 7.9695 | $240,286 |
| South Wilmington | Greenfield Twp | $3,772 | $3,439 | 2.10% | 8.0793 | $179,837 |
| East Brooklyn | Greenfield Twp | $3,756 | $3,411 | 2.09% | 8.0458 | $179,837 |
| Kinsman | Highland Twp | $3,361 | $3,053 | 1.98% | 7.6942 | $169,415 |
| Diamond | Braceville Twp | $3,258 | $3,056 | 1.43% | 5.4882 | $228,165 |
Grundy County compared with Illinois and the US
| Area | Effective rate | Median bill | Median home value |
|---|---|---|---|
| Grundy County | 2.03% | $5,260 | $259,200 |
| Illinois median | 2.07% | $5,189 | $250,500 |
| United States median | 0.98% | $2,969 | n/a |
Grundy County compared with neighboring counties
Grundy County borders 5 counties. Ranked from lowest to highest median effective rate, it places 1 of 6, the lowest in its area.
| County | Effective rate | Median bill | Median home value |
|---|---|---|---|
| Grundy County | 2.03% | $5,260 | $259,200 |
| LaSalle County | 2.15% | $3,336 | $154,900 |
| Livingston County | 2.18% | $2,867 | $131,500 |
| Kankakee County | 2.22% | $4,125 | $185,700 |
| Will County | 2.35% | $6,993 | $298,000 |
| Kendall County | 2.53% | $7,556 | $298,900 |
Illinois statewide: General Homestead Exemption of up to $10,000 of equalized assessed value in Cook County, $8,000 in the counties contiguous to Cook, and $6,000 elsewhere. The Senior Citizens Homestead Exemption adds $8,000 in Cook and the contiguous counties or $5,000 elsewhere, and a senior assessment freeze is available under an income limit.
Due dates and payment
Illinois statewide: two installments, typically due June 1 and September 1 (Cook County: March 1 and August 1, often delayed). Confirm the local schedule with the Grundy County tax office.
Appealing your assessment
30 days from the township assessment notice; a second appeal to the county Board of Review follows. Bring recent sales of comparable homes, photos of condition issues, and any error in the record such as square footage or lot size. How to appeal, step by step.
How Illinois assesses value
33 1/3% of fair market value statewide; Cook County classifies property and assesses residential at 10%, then a state equalization factor is applied. Full Illinois rules, exemptions and deadlines.
Rates and medians: U.S. Census Bureau, ACS 2023 5-year estimates, tables B25103 and B25077. Effective rate is median taxes paid divided by median owner-occupied home value. Places: Census place by county reference file. Illinois cities and county rates: Illinois Department of Revenue, Property Tax Statistics, 2024 and 2023. Neighbors: Census county adjacency file. Rules: Illinois Department of Revenue, Property Tax Exemption Information (PIO-74).
Frequently asked questions
What is the property tax rate in Grundy County, IL?
The median effective property tax rate in Grundy County is 2.03% of home value, below the Illinois median of 2.07% and above the national median of 0.98%. The median homeowner pays $5,260 a year on a median home value of $259,200 (Census ACS 2023 5-year).
How much is property tax on a $400,000 house in Grundy County?
About $8,120 per year at the county's median effective rate of 2.03%, before exemptions. The exact bill depends on the city, school district and special districts that serve the parcel, so treat this as a planning estimate.
When are property taxes due in Grundy County?
Illinois statewide: two installments, typically due June 1 and September 1 (Cook County: March 1 and August 1, often delayed). Check the Grundy County tax office for the exact local dates.
How do I appeal a property tax assessment in Grundy County?
30 days from the township assessment notice; a second appeal to the county Board of Review follows. Full Illinois rules are on the Illinois page.
How does Grundy County compare with the rest of Illinois?
Grundy County ranks 31 of 102 Illinois counties by effective rate. The Illinois median is 2.07% and the median bill is $5,189.