Williamson County Property Taxes
Williamson County, Illinois
Effective Tax Rate
0.00%
10.5% below state avgMedian Annual Tax
$0
$208/mo escrow
Estimate Your Tax
Annual Tax
$0
Monthly
$0
Eff. Rate
1.71%
At a Glance
Median Home Value
$145,600
State avg ▼ $146,132
Tax w/ Mortgage/yr
$2,924
$244/mo escrow
Tax w/o Mortgage/yr
$1,729
$144/mo
State Tax Rate Rank
#41
of 102 counties (1 = lowest)
Data Story
About Property Taxes in Williamson County, Illinois
Williamson County taxes below national median
At 1.710%, Williamson County's effective rate falls comfortably below the national median, with homeowners paying $2,490 annually versus the U.S. median of $2,690. The county ranks in the bottom 30% nationally for tax burden.
Williamson ranks near state average in taxes
Illinois' average effective rate is 1.831%, and Williamson County comes in just below at 1.710%, placing it slightly favorable compared to most of the state. The median tax of $2,490 also undercuts the state median of $2,782.
Williamson undercuts southern Illinois neighbors
Williamson County's 1.710% rate beats nearby Jackson County and White County, positioning it favorably within the southern Illinois region. The rate reflects moderate home values and relatively restrained tax collection in the area.
Typical Williamson homeowner pays $2,490 yearly
On a median home valued at $145,600, annual property taxes run $2,490—about $207 monthly. Homeowners with mortgages add roughly $245 monthly to escrow, creating a combined payment near $452 per month.
Williamson homeowners can challenge overassessments
Even in moderate-tax Williamson County, many properties are assessed above fair market value, particularly in growing areas. Homeowners should request a reassessment review if recent comparable sales suggest their home's assessed value is inflated.
How Williamson County Compares
Median Annual Property Tax
Williamson County
1.71%
Effective rate
Illinois Avg
1.90%
Effective rate
National Avg
0.91%
Effective rate
Frequently Asked Questions
What is the property tax rate in Williamson County, Illinois?
How much are property taxes in Williamson County?
How does Williamson County compare to the Illinois average?
What is the median home value in Williamson County, Illinois?
Is Williamson County a low property tax area in Illinois?
How does Williamson County rank for property taxes in Illinois?
Counties with Similar Tax Rates
Nearby Counties
Other Counties in Illinois
Data updated: March 2026
Data from U.S. Census Bureau, American Community Survey 2019-2023 5-Year Estimates. Effective tax rate is calculated as median property tax divided by median home value.