County Treasurer



Williamson County Treasurer
407 N. Monroe Street, Suite 104
Marion, IL 62959
Phone: 618-998-2142
Fax: 618-997-2541

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.

Contact Us

Property Tax Payment Dates

1st Installment: July 11, 2019

2nd Installment: September 12, 2019

 Make checks payable to: "Williamson County Treasurer"


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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.