New Windsor, Mercer County, Illinois Property Taxes
Property Taxes in New Windsor, Illinois
Median New Windsor, Illinois effective property tax rate: 2.59%, significantly higher than the national median of 1.02%, and higher than the Illinois state median of 2.33%.
Median New Windsor, Illinois home value: $131,940
Median annual New Windsor, Illinois tax bill: $3,160, $760 higher than the national median property tax bill of $2,400.
How are property taxes in Mercer calculated?
Property taxes in New Windsor, Illinois 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 New Windsor's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in New Windsor, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
New Windsor, Mercer County, Illinois Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
2.59%
Estimate Property Tax Bill
$3,417
$3,171
How Does the New Windsor Property Tax Calculator Work?
Use this New Windsor property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies New Windsor's median effective tax rate of 2.59% — based on actual property records in Mercer County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local appraisal district uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies New Windsor's median effective rate across all local levies, providing a more accurate estimate than applying a single county millage rate.
Your bill may vary by ZIP code within New Windsor: rates range from 2.59% in 61465 to 2.59% in 61465, primarily due to differences in school district levies and local assessment districts.
For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across New Windsor.
About New Windsor Property Taxes
About Property Taxes in New Windsor, Mercer, IL
New Windsor’s median effective property tax rate of 2.59% is higher than the Illinois state median of 2.33% and higher than the national median of 1.02%. This rate reflects Mercer County levies and local taxing districts that shape what homeowners pay across the city.
Property tax rates are not uniform across New Windsor. Homeowners in ZIP code 61465 carry the same median effective rate of 2.59%, with a median tax bill of $3,160 and a median home price of $131,940. That bill is above the national median property tax bill of $2,400 and $760 higher than the state median bill.
New Windsor homeowners who believe their assessed value is too high can file a formal appeal with the Tax Assessor before November 7, 2025.
If your estimated bill seems higher than expected, Ownwell can review your assessment and protest on your behalf. You only pay if we save you money.
Property Tax Rates Across New Windsor, Mercer County, Illinois
As noted earlier, local government entities set tax rates, which can vary widely within a state.
Why? Because annually, each county estimates its required budget to provide services and divides that by the total value of all taxable property within its jurisdiction. This calculation results in the property tax rate.
While there are votes and laws involved in setting tax rates and budgets, in a nutshell, this is the annual process.
Below, you can compare New Windsor's effective property tax rate to other cities in Illinois and the median property tax rates in Illinois and the U.S.
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 New Windsor Tax Rate
2.59%
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 Mercer County Tax Rate
2.81%
Median Effective Illinois Tax Rate
2.33%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across New Windsor, Mercer County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61465 | 1.82% | 2.28% | 2.59% | 2.87% | 3.05% |
Source: Ownwell
Property Tax Assessment Values Across New Windsor, Mercer County, Illinois
When examining property taxes in New Windsor, 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 Mercer 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 Mercer County, assessment notices are sent in the spring each year. They'll typically reach your mailbox by the middle of the month when notices are sent.
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 home price in New Windsor is $131,940, with tax bills ranging significantly across the county. Zip code 61465 has the highest median home price at $131,940.
Property Tax Assessment Values Across New Windsor, Mercer County, Illinois
Source: Ownwell
$103,635
$155,352
$207,068
Median New Windsor Market Value
$131,940
Median Mercer County Market Value
$150,030
Median Illinois Market Value
$227,888
Median United States Market Value
$235,294
Property Tax Assessment Values Across New Windsor, Mercer County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61465 | $26,322 | $76,192 | $131,940 | $200,830 | $304,421 |
Source: Ownwell
Property Tax Bills Across New Windsor, Mercer County, Illinois
Property tax bills in New Windsor are based on the assessed value of a home and the local tax rate set by taxing authorities in Mercer County. When a property is reassessed, the local assessor estimates its market value, and that value is used to calculate the tax bill after any exemptions or adjustments are applied. Because the bill is tied to assessed value, homeowners with higher-valued homes generally pay more.
The median home price in New Windsor is $131,940, and the median property tax bill is $3,160, which is above the national median property tax bill of $2,400 and the national median property tax rate of 1.02%. Tax bills can vary widely, with the 25th percentile at $1,724 and the 75th percentile at $4,984. For homeowners, this means property taxes can have a meaningful impact on monthly housing costs and long-term affordability.
Median New Windsor Tax Bill
$3,160
Median Mercer County Tax Bill
$4,254
Median Illinois Tax Bill
$5,277
Median United States Tax Bill
$2,400
Property Tax Bills Across New Windsor, Mercer County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61465 | $777 | $1,724 | $3,160 | $4,984 | $7,691 |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | November 7 |
Links | |
|---|---|
| Mercer Tax Assessor | |
| Website | merceril.devnetwedge.com |