When are property taxes due in Iroquois County, Illinois?

Iroquois 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 Iroquois County, Illinois?

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

How do I pay Iroquois County, Illinois property taxes?

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

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Iroquois County Property Tax Due Date

Illinois

(815) 432-6985

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

Iroquois County Treasurer

Phone

(815) 432-6985

How to Pay

Online

Pay using credit card or e-check

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By Mail

Mail check payable to Iroquois County Treasurer

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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 Iroquois County

Iroquois County is a county located in the northeast part of the U.S. state of Illinois. According to the 2020 United States Census, it has a population of 27,077. It is the only county in the United States named Iroquois.

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

Related Resources

CountyRollCounty Office Directory

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Property Tax FAQ Tax Calendar

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We'll email you 14 days 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.