Mendon, Adams County, Illinois Property Taxes
Property Taxes in Mendon, Illinois
Median Mendon, Illinois effective property tax rate: 2.39%, significantly higher than the national median of 1.02%, and higher than the Illinois state median of 2.33%.
Median Mendon, Illinois home value: $88,260
Median annual Mendon, Illinois tax bill: $2,106, $294 lower than the national median property tax bill of $2,400.
How are property taxes in Adams County calculated?
Property taxes in Mendon, 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 Mendon’s property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Mendon, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Mendon, Adams County, Illinois Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
2.39%
Estimate Property Tax Bill
$2,109
$1,957
How Does the Mendon Property Tax Calculator Work?
Use this Mendon property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Mendon’s median effective tax rate of 2.39% — based on actual property records in Adams County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local assessment 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 Mendon’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 Mendon: rates range from 2.39% in 62351 to 2.39% in 62351, 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 Mendon.
About Mendon Property Taxes
About Property Taxes in Mendon, Adams, Illinois
Mendon’s median effective property tax rate of 2.39% is higher than the Illinois state median of 2.33% and higher than the national median of 1.02%. This rate reflects the Adams County base levy combined with local school district levies and Special service areas (SSAs) that vary by subdivision throughout the city.
Property tax rates are not uniform across Mendon. Homeowners in the 62351 ZIP code carry a median effective rate of 2.39%, while those in 62351 pay 2.39%. This spread — 0 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Adams County. Understanding which part of Mendon you live in can make a meaningful difference to your annual tax bill.
Mendon homeowners who believe their assessed value is too high can file a formal appeal with the local Tax Assessor before the June 1, 2026 deadline each year.
If your estimated bill above 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 Mendon, Adams 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 Mendon’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 Mendon Tax Rate
2.39%
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 Adams County Tax Rate
2.17%
Median Effective Illinois Tax Rate
2.33%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Mendon, Adams County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 62351 | 2.39% | 2.39% | 2.39% | 2.39% | 2.39% |
Source: Ownwell
Property Tax Assessment Values Across Mendon, Adams County, Illinois
When examining property taxes in Mendon, Illinois, 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 Adams 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 Adams 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 Mendon is $88,260, with tax bills ranging significantly across the county. The median property tax bill is $2,106, compared with the national median property tax bill of $2,400 and the national median property tax rate of 1.02%.
Property Tax Assessment Values Across Mendon, Adams County, Illinois
Source: Ownwell
$44,130
$110,003
$175,875
Median Mendon Market Value
$88,260
Median Adams County Market Value
$96,300
Median Illinois Market Value
$227,888
Median United States Market Value
$235,294
Property Tax Assessment Values Across Mendon, Adams County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 62351 | $41,910 | $52,380 | $88,260 | $165,390 | $182,982 |
Source: Ownwell
Property Tax Bills Across Mendon, Adams County, Illinois
Property tax bills in Mendon are based on the assessed value of a home and the local tax rate set by taxing authorities. When a property’s market value is determined, the assessed value is used to calculate the amount owed, so changes in home value can directly affect the bill. For homeowners, this means a higher assessed value can lead to a larger tax bill, while a lower assessed value may reduce it.
In Mendon, the median home price is $88,260, and the median property tax bill is $2,106. That amount is below the national median property tax bill of $2,400, but bills can vary widely across the city. The 25th percentile tax bill is $1,072, while the 75th percentile is $3,946, and the 90th percentile reaches $4,366. These differences show how property characteristics and assessment outcomes can create very different tax burdens for homeowners in the same area.
Median Mendon Tax Bill
$2,106
Median Adams County Tax Bill
$2,088
Median Illinois Tax Bill
$5,277
Median United States Tax Bill
$2,400
Property Tax Bills Across Mendon, Adams County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 62351 | $996 | $1,072 | $2,106 | $3,946 | $4,366 |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | June 1 |
Links | |
|---|---|
| Adams Tax Assessor | |
| Website | adamsil.devnetwedge.com |