Boone County, Illinois Property Taxes
Property Taxes in Boone County, Illinois
Median Boone County effective property tax rate: 2.48%, significantly higher than the national median of 1.02%.
Median Boone County home value: $205,580
Median annual Boone County tax bill: $4,861, $2,461 higher than the national median property tax bill of $2,400.
How are property taxes in Boone County calculated?
Property taxes in Boone 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 property taxes in Boone County higher than the national median? Boone County’s effective property tax rate of 2.48% is well above the national median of 1.02%, which helps explain the larger annual tax bill.
What can reduce a Boone County property tax bill? Exemptions and reduction opportunities can lower the assessed value used for taxation and may create meaningful savings.
Whether you live in Boone County or another part of the county, understanding your property tax assessment, exemptions, and appeal options can help you manage your tax burden.
Last Updated April 13, 2026
Boone County, Illinois Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
2.48%
Estimate Property Tax Bill
$5,098
$4,731
How Does the Boone County Property Tax Calculator Work?
Use this Boone County property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Boone County's median effective tax rate of 2.48% 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. Boone 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%.
For a more precise estimate, scroll down to explore city and ZIP code-level tax rate trends across Boone County.
Property Tax Rates Across Boone County, Illinois
What Are Effective Property Tax Rates Across Boone County?
Local government entities set tax rates, which vary widely across Boone 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 Boone County's effective property tax rate to other counties in Illinois or the U.S. median of 1.02%.
Boone County's median effective rate stands at 2.48%, which is higher than the national median of 1.02%. Within Boone County, the highest rate is found in Kirkland at 2.66%, while South Beloit has the lowest at 2.27%.
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 Ă· 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 Boone County Tax Rate
2.48%
Our median effective property tax rate (tax bill Ă· 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 Boone County, Illinois
| City | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Belvidere | 2.12% | 2.38% | 2.54% | 2.70% | 2.88% |
| Caledonia | 2.12% | 2.27% | 2.40% | 2.53% | 2.58% |
| Capron | 1.97% | 2.32% | 2.44% | 2.61% | 2.70% |
| Cherry Valley | 2.17% | 2.43% | 2.56% | 2.69% | 2.73% |
| Garden Prairie | 1.90% | 2.25% | 2.42% | 2.59% | 2.70% |
| Harvard | 2.03% | 2.29% | 2.39% | 2.53% | 2.71% |
| Kingston | 2.12% | 2.30% | 2.44% | 2.62% | 2.62% |
| Kirkland | 2.26% | 2.47% | 2.66% | 2.81% | 2.83% |
| Loves Park | 2.22% | 2.37% | 2.49% | 2.51% | 2.53% |
| Poplar Grove | 2.04% | 2.24% | 2.33% | 2.48% | 2.59% |
| Rockford | 2.39% | 2.42% | 2.52% | 2.54% | 2.58% |
| Roscoe | 2.12% | 2.20% | 2.33% | 2.38% | 2.46% |
| South Beloit | 2.02% | 2.19% | 2.27% | 2.44% | 2.46% |
| Genoa | N/A | N/A | N/A | N/A | N/A |
| Marengo | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Assessment Values Across Boone County, Illinois
When examining property taxes in Boone 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 Boone 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 Boone County, assessment notices are sent in the spring each year. They’ll typically reach your mailbox by the middle of April.
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 context, Boone County’s median tax bill is $4,861, compared with the national median property tax bill of $2,400. Tax bills vary widely across the county, with Rockford at $9,174 and Kingston at $4,349.
Median Boone County Market Value
$205,580
Median Illinois Market Value
$227,888
Median United States Market Value
$235,294
Property Tax Assessment Values Across Boone County, Illinois
| City | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Belvidere | $25,976 | $122,196 | $183,606 | $265,916 | $360,458 |
| Caledonia | $146,010 | $216,214 | $321,003 | $456,305 | $600,850 |
| Capron | $89,451 | $134,132 | $189,404 | $243,359 | $337,310 |
| Cherry Valley | $180,770 | $226,204 | $304,962 | $369,058 | $428,224 |
| Garden Prairie | $95,731 | $140,431 | $222,668 | $311,716 | $408,721 |
| Harvard | $71,554 | $183,096 | $223,137 | $276,213 | $354,809 |
| Kingston | $103,156 | $168,001 | $190,293 | $248,716 | $272,180 |
| Kirkland | $153,236 | $205,485 | $293,157 | $382,110 | $478,552 |
| Loves Park | $226,032 | $302,904 | $330,252 | $370,275 | $393,363 |
| Poplar Grove | $109,998 | $181,716 | $206,202 | $264,825 | $343,520 |
| Rockford | $312,627 | $341,336 | $371,577 | $421,761 | $535,497 |
| Roscoe | $206,172 | $242,934 | $331,878 | $375,255 | $454,266 |
| South Beloit | $125,853 | $181,873 | $232,810 | $340,809 | $412,739 |
| Genoa | N/A | N/A | N/A | N/A | N/A |
| Marengo | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Bills Across Boone County, Illinois
Property tax bills in Boone County are based on the assessed value of a home, not its market price alone. Local taxing authorities apply the county’s tax rate to that assessment, and the final bill reflects the combination of school, municipal, and other local levies. For homeowners, this means two similar homes can receive different tax bills if their assessed values or applicable exemptions differ.
With a median home price of $205,580, Boone County homeowners face property tax bills that can vary widely. The 25th percentile tax bill is $3,265, while the 75th percentile is $7,320 and the 90th percentile reaches $9,633. That range shows how strongly taxes can affect household budgets, especially when assessments rise faster than income.
Across the county, the highest median tax bill is $9,174 in Rockford, while the lowest median tax bill is $4,349 in Kingston. Understanding how your property is assessed and whether exemptions apply can make a meaningful difference in what you owe each year.
Median Boone County Tax Bill
$4,861
Median Illinois Tax Bill
$5,277
Median United States Tax Bill
$2,400
Property Tax Bills Across Boone County, Illinois
| City | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| Belvidere | $652 | $2,835 | $4,521 | $6,896 | $9,089 |
| Caledonia | $3,073 | $4,805 | $7,415 | $11,122 | $14,961 |
| Capron | $1,417 | $3,038 | $4,488 | $5,799 | $8,509 |
| Cherry Valley | $3,388 | $5,367 | $7,518 | $9,594 | $11,398 |
| Garden Prairie | $1,783 | $2,960 | $5,177 | $7,399 | $10,216 |
| Harvard | $2,063 | $4,445 | $5,023 | $6,356 | $8,280 |
| Kingston | $2,276 | $3,537 | $4,349 | $6,161 | $6,863 |
| Kirkland | $4,150 | $5,069 | $7,912 | $10,888 | $12,575 |
| Loves Park | $5,409 | $7,232 | $8,209 | $9,300 | $9,981 |
| Poplar Grove | $2,321 | $3,817 | $4,664 | $6,484 | $8,561 |
| Rockford | $7,107 | $8,364 | $9,174 | $10,607 | $13,598 |
| Roscoe | $3,367 | $5,254 | $7,389 | $8,905 | $10,769 |
| South Beloit | $2,660 | $3,903 | $5,137 | $7,538 | $9,316 |
| Genoa | N/A | N/A | N/A | N/A | N/A |
| Marengo | 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 | |
|---|---|
| Boone Tax Assessor | |
| Website | booneil.devnetwedge.com |