Williamson County property tax, in one number.
The typical Williamson County homeowner pays $2,690 a year on a $156,400 home. That's below the Illinois rate (2.01%) and well above the U.S. rate (0.94%).
Estimate my taxWilliamson County at a glance
Five numbers that shape a typical property tax bill here.
Property tax calculator
Enter a home value to see a typical yearly bill at Williamson County's average effective rate, or pick another area.
- Bills are rising faster than values.The median tax paid went from $1,567 in 2015 to $2,798 in 2024 (+79%), and home values changed +72%.
- 61st highest rate in Illinois.Out of 102 Illinois counties with full data. Nationally, the rate is higher than in 94% of U.S. counties.
- Mortgage holders pay more.Homes with a mortgage paid a median $3,136, versus $2,062 for homes owned outright, often because they're newer, higher-value or more recently reassessed.
The data, charted
Median tax paid & effective rate
Owners vs renters
Effective rate by city
Largest Illinois counties
| County | Median tax | Rate |
|---|---|---|
| Lake County | $8,923 | 2.58% |
| Will County | $7,173 | 2.24% |
| DuPage County | $8,007 | 2.05% |
| Cook County | $6,191 | 1.91% |
| Williamson County | $2,690 | 1.72% |
| Illinois | $5,298 | 2.01% |
Compare neighboring counties
Effective property tax rates in and around Williamson County.
Cities and towns in Williamson County
Places with at least 2,000 owner-occupied homes and reliable survey data.
Good to know
What is the property tax rate in Williamson County?
The effective rate is about 1.72%. The median homeowner pays $2,690 a year on a home worth a median $156,400 (ACS 2020–2024). The legal tax rates set by each taxing unit are different numbers; the effective rate is what owners actually pay as a share of value.
How much is property tax on a $150,000 home in Williamson County?
About $2,580 a year, or roughly $215 a month, at Williamson County's average effective rate of 1.72%. Homestead, senior, veteran or other exemptions can lower the real bill, and a recent purchase or reassessment can raise it.
Why is my bill different from this estimate?
Your bill depends on your home's assessed value from the county assessor, the exact taxing units where you live (county, city, school district, special districts) and any exemptions you get. These figures are medians across all owner-occupied homes, not a bill for any address.
How current is this data?
It comes from the U.S. Census Bureau's American Community Survey 5-year estimates for 2020–2024, the latest release. Homeowners report the taxes they paid, so the numbers lag current bills by one to two years. We update the site when the Census Bureau publishes new estimates each December.
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