Monmouth, Warren County, Illinois Property Taxes
Property Taxes in Monmouth, Illinois
Median Monmouth, Illinois effective property tax rate: 3.58%, significantly higher than the national median of 1.02%, and higher than the Illinois state median of 2.33%.
Median Monmouth, Illinois home value: $34,350
Median annual Monmouth, Illinois tax bill: $1,689, $711 lower than the national median property tax bill of $2,400.
How are property taxes in Warren calculated?
Property taxes in Monmouth, 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 Monmouth's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Monmouth, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Monmouth, Warren County, Illinois Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
3.58%
Estimate Property Tax Bill
$1,230
$1,141
How Does the Monmouth Property Tax Calculator Work?
Use this Monmouth property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Monmouth's median effective tax rate of 3.58% — based on actual property records in Warren County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local assessor uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Monmouth'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 Monmouth: rates differ across local districts, primarily due to differences in school district levies and local assessment districts. Monmouth's median property tax rate is higher than Illinois's 2.33% median rate and the median tax bill of $1,689 is $711 lower than the state median bill.
For a more precise estimate, scroll down to explore ZIP code-level tax rate trends across Monmouth.
About Monmouth Property Taxes
About Property Taxes in Monmouth, Warren, Illinois
Monmouth’s median effective property tax rate of 3.58% is higher than the Illinois state median of 2.33% and higher than the national median of 1.02%. This rate reflects the Warren County levy combined with local school district levies and other local taxing districts that shape property taxes across the city.
Property tax rates are not uniform across Monmouth. Homeowners here are taxed at different levels depending on how local boundaries are drawn, which can affect the assessed value used for taxation and the final bill. That means two homes in the same city may not face the same property tax burden.
Monmouth homeowners who believe their assessed value is too high can file a formal appeal with the Tax Assessor before the June 1, 2026 deadline each year.
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 Monmouth, Warren 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 Monmouth'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 ÷ 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 MonmouthTax Rate
3.58%
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 WarrenCounty Tax Rate
3.58%
Median Effective IllinoisTax Rate
2.33%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Monmouth, Warren County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61462 | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Assessment Values Across Monmouth, Warren County, Illinois
When examining property taxes in Monmouth, 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 Warren 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 Warren 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 Monmouth.
For example, the median home price in Monmouth is $34,350, with tax bills ranging significantly across the county. Monmouth’s median property tax bill is $1,689, below the national median property tax bill of $2,400 and below the national median property tax rate of 1.02%.
Median Monmouth Market Value
$34,350
Median Warren County Market Value
$32,160
Median Illinois Market Value
$227,888
Median United States Market Value
$235,294
Property Tax Assessment Values Across Monmouth, Warren County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61462 | N/A | N/A | N/A | N/A | N/A |
Source: Ownwell
Property Tax Bills Across Monmouth, Warren County, Illinois
How Are Property Tax Bills Calculated in Monmouth, Illinois?
Property tax bills in Monmouth are based on the assessed value of a home, not its market price alone. Local taxing authorities apply their tax rates to that assessed value, and the final bill reflects the combined impact of county, city, school, and other local levies. For homeowners, this means a property tax bill can change when a home’s assessed value changes or when local tax rates are adjusted.
In Monmouth, the median home price is $34,350, and property tax bills vary widely across homeowners. The 25th percentile bill is $1,042, while the 75th percentile bill is $2,494 and the 90th percentile bill is $3,357. That range shows how different assessments and local tax burdens can affect what residents pay each year.
Compared with the national median property tax rate of 1.02% and the national median property tax bill of $2,400, Monmouth homeowners may see bills that are lower or higher depending on their property’s assessed value and local tax rates.
Median Monmouth Tax Bill
$1,689
Median Warren County Tax Bill
$1,579
Median Illinois Tax Bill
$5,277
Median United States Tax Bill
$2,400
Property Tax Bills Across Monmouth, Warren County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61462 | 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 | |
|---|---|
| Warren Tax Assessor | |
| Website | warrenil.devnetwedge.com |