Williamson County Treasurer
407 N. Monroe Street, Suite 104
Marion, IL 62959
Office Hours: Monday-Friday, 8:00 a.m. - 4:00 p.m.
On Real Estate Collection Due Dates: 8:00 a.m. - 6:00 p.m.
Property Tax Payment Dates
1st Installment: July 11, 2019
2nd Installment: September 12, 2019
Make checks payable to: "Williamson County Treasurer"
- Property Tax Payment Instructions
- Property Tax Exemptions
- Tax Collection Schedule
- Tax Sale Information
- Property Tax FAQ
- Guide to the Tax Process
- Property Tax Prepayment Program
- Returned Checks
A 1-1/2% interest amount will be charged on the delinquent amount per month or ANY portion of a month.
To avoid the publication of your name as being a delinquent taxpayer, pay by October 4, 2019.
The property tax sale will be Tuesday, November 5, 2019.
No property tax payments will be accepted after Monday, November 4, 2019.
There is a $25 processing fee, in addition to any accrued statutory interest, for each check that is returned by the taxpayer's bank for any reason.