When are property taxes due in St. Clair County, Illinois?

St. Clair County property taxes are due Varies (Cook Co.: March 1). A second installment is due Varies (Cook Co.: August 1). This deadline applies to all counties in Illinois.

What is the penalty for late property tax payment in St. Clair County, Illinois?

The late payment penalty in St. Clair County is 1.5% per month starting day after due.

How do I pay St. Clair County, Illinois property taxes?

You can pay St. Clair County property taxes via Online, mail, in-person.

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St. Clair County Property Tax Due Date

Illinois

2026 Property Tax Due Dates

Installment 1

Varies (Cook Co.: March 1)

First installment (varies by county)

Installment 2

Varies (Cook Co.: August 1)

Second installment

Penalty: 1.5% per month starting day after dueGrace period: None

Payment Methods

Online, Mail, In-Person

St. Clair County Treasurer

How to Pay

Online

Pay using credit card or e-check

By Mail

Mail check payable to St. Clair County Treasurer

In Person

Visit the Treasurer's office

Other Counties in Illinois

Adams Alexander Bond Boone Brown Bureau Calhoun Carroll

View all Illinois counties →

About St. Clair County

St. Clair County is the ninth most populous county in Illinois. Located directly east of St. Louis, the county is part of the Metro East region of the Greater St. Louis metropolitan area in southern Illinois. As of the 2020 United States census, St. Clair County had a population of 257,400, making it the second most populous county in Illinois outside the Northern Third.

Source: Wikipedia — content available under CC BY-SA 4.0

Related Resources

CountyRollCounty Office Directory

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Due dates shown are for reference only. Contact your county treasurer's office to confirm official deadlines before making payments.