Williamson County Property Tax Rate — Illinois 2026
In Williamson County, Illinois, homeowners pay a median annual property tax of $2,490 on a median home value of $145,600, resulting in an effective property tax rate of 1.71%. This rate is 0.36% lower than the Illinois state average (2.07%) and 0.80% higher than the national average (0.91%).
How Williamson County Compares
Property taxes in Williamson County are above the national average but closer to the Illinois state average, indicating a moderate tax burden for the region.
Property Tax Calculator for Williamson County
Enter your home’s estimated market value to calculate your approximate annual property tax in Williamson County, Illinois.
This estimate uses the effective tax rate of 1.71% based on ACS data. Actual taxes may differ based on local assessments, exemptions, and levies.
Housing Breakdown
Property Tax Details for Williamson County, Illinois
The median property tax paid by homeowners in Williamson County is $2,490 per year. Based on a median home value of $145,600, this translates to an effective property tax rate of 1.71%.
For context, the statewide median property tax in Illinois is $5,189 with an effective rate of 2.07%, while the national average effective rate stands at 0.91%. Williamson County’s effective rate is 0.36% lower than the Illinois state average (2.07%).
Of the 28,774 housing units in Williamson County, approximately 71.13% are owner-occupied and 28.87% are renter-occupied. Homeownership rates can influence local tax policy, as communities with higher ownership rates often see more voter engagement on property tax issues.
Important: The data on this page is for informational purposes only and should not be used as tax advice. Actual property taxes depend on your property’s assessed value, local millage rates, and any applicable exemptions. Contact your county assessor’s office for precise tax information.