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 26, 2021

2nd Installment: October 14, 2021

 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, your payment must be received by November 12, 2021.

The property tax sale will be December 9, 2021.

No property tax payments will be accepted after December 8, 2021.

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.