When are property taxes due in Jefferson County, Illinois?

Jefferson 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 Jefferson County, Illinois?

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

How do I pay Jefferson County, Illinois property taxes?

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

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Jefferson County Property Tax Due Date

Illinois

(618) 244-8010

2026 Property Tax Due Dates

Official Source

Installment 1

Varies (Cook Co.: March 1)

First installment (varies by county)

Installment 2

Varies (Cook Co.: August 1)

Second installment

Pay Taxes Online →

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

Payment Methods

Online, Mail, In-Person

Jefferson County Treasurer

Phone

(618) 244-8010

How to Pay

Online

Pay using credit card or e-check

Visit Website →

By Mail

Mail check payable to Jefferson County Treasurer

Visit Website →

In Person

Visit the Treasurer's office

Visit Website →

Other Counties in Illinois

Adams Alexander Bond Boone Brown Bureau Calhoun Carroll

View all Illinois counties →

About Jefferson County

Jefferson County is a county located in the southern part of the U.S. state of Illinois. According to the 2020 census, it has a population of 37,113. The county seat is Mount Vernon.

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

Related Resources

CountyRollCounty Office Directory

Find the assessor, treasurer & recorder for Jefferson

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Property Tax FAQ Tax Calendar

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We'll email you 2 weeks before your property taxes are due.

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