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.

Contact Us

Property Tax Payment Dates

1st Installment: August 27, 2020

2nd Installment: October 8, 2020

 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 November 8, 2020.

The property tax sale will be Thursday, December 10, 2020.

No property tax payments will be accepted after Wednesday, December 9, 2020.

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.