Williamsfield, Knox County, Illinois Property Taxes
Property Taxes in Williamsfield, Illinois
Median Williamsfield, Illinois effective property tax rate: 2.53%, significantly higher than the national median of 1.02%, and higher than the Illinois state median of 2.33%.
Median Williamsfield, Illinois home value: $170,580
Median annual Williamsfield, Illinois tax bill: $3,972, $1,572 higher than the national median property tax bill of $2,400.
How are property taxes in Knox calculated?
Property taxes in Williamsfield, 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 Williamsfield's property tax system, exemptions, and reduction opportunities can lead to significant savings. Regardless of where you live in Williamsfield, knowing local tax details benefits homeowners and investors.
Last Updated April 13, 2026
Williamsfield, Knox County, Illinois Property Tax Bill Calculator
$100,000
$1,500,000
$3,000,000
Median Effective Tax Rate
2.53%
Estimate Property Tax Bill
$4,316
$4,005
How Does the Williamsfield Property Tax Calculator Work?
Use this Williamsfield property tax calculator to estimate your annual property tax bill. Enter your property's assessed value and our calculator applies Williamsfield's median effective tax rate of 2.53% — based on actual property records in Knox County — to generate your estimate.
Enter your property's estimated assessed value — the figure the local assessment process uses to calculate your bill, which reflects any exemptions you hold and is typically lower than your home's market value. Our calculator applies Williamsfield'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 Williamsfield: rates range from 2.53% in 61489 to 2.53% in 61489, 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 Williamsfield.
About Williamsfield Property Taxes
About Property Taxes in Williamsfield, Knox, Illinois
Williamsfield's median effective property tax rate of 2.53% is higher than the Illinois state median of 2.33% and higher than the national median of 1.02%. This rate reflects the Knox 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 Williamsfield. Homeowners in the 61489 ZIP code carry a median effective rate of 2.53%, while those in 61489 pay 2.53%. This spread — 0 percentage points across the same city — reflects how school district boundaries and local assessment districts are drawn across Knox County. Understanding which part of Williamsfield you live in can make a meaningful difference to your annual tax bill.
Williamsfield 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 Williamsfield, Knox 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 Williamsfield'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 Williamsfield Tax Rate
2.53%
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 Knox County Tax Rate
2.82%
Median Effective Illinois Tax Rate
2.33%
Median Effective United States Tax Rate
1.02%
Property Tax Rates Across Williamsfield, Knox County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Rate | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61489 | 1.75% | 2.29% | 2.53% | 2.65% | 2.78% |
Source: Ownwell
Property Tax Assessment Values Across Williamsfield, Knox County, Illinois
When examining property taxes in Williamsfield, 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 Knox County tax assessor 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 Knox 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. 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 Williamsfield.
For example, the median home price in Williamsfield is $170,580, with tax bills ranging significantly across the county. 61489 has the highest median home price at $170,580.
Property Tax Assessment Values Across Williamsfield, Knox County, Illinois
Source: Ownwell
$40,530
$174,788
$309,045
Median Williamsfield Market Value
$170,580
Median Knox County Market Value
$93,540
Median Illinois Market Value
$227,888
Median United States Market Value
$235,294
Property Tax Assessment Values Across Williamsfield, Knox County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Home Price | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61489 | $59,094 | $99,945 | $170,580 | $240,172 | $409,119 |
Source: Ownwell
Property Tax Bills Across Williamsfield, Knox County, Illinois
Property tax bills in Williamsfield are based on the assessed value of a home and the local tax rate set by taxing authorities in Knox County. When a property’s market value changes, the assessed value can change too, which affects the final bill. For a home with a median market value of $170,580, the property tax bill can vary widely depending on exemptions, local levies, and how the assessment is applied.
Homeowners in Williamsfield often see bills that reflect more than just the home itself, since school districts, county services, and other local government needs are all part of the calculation. The median tax bill in the area is $3,972, which is above the national median property tax bill of $2,400 and the national median property tax rate of 1.02%. Bills can range from $2,166 at the 25th percentile to $10,507 at the 90th percentile, showing how much property taxes can affect household costs.
Median Williamsfield Tax Bill
$3,972
Median Knox County Tax Bill
$2,355
Median Illinois Tax Bill
$5,277
Median United States Tax Bill
$2,400
Property Tax Bills Across Williamsfield, Knox County, Illinois
| Zip | 10th Percentile | 25th Percentile | Median Tax Bill | 75th Percentile | 90th Percentile |
|---|---|---|---|---|---|
| 61489 | $1,046 | $2,166 | $3,972 | $6,100 | $10,507 |
Source: Ownwell
Don't miss the deadline to appeal!
Dates | |
|---|---|
| Appeal Deadline | June 1 |
Links | |
|---|---|
| Knox Tax Assessor | |
| Website | knoxil.devnetwedge.com |