When are property taxes due in Rock Island County, Illinois?

Rock Island 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 Rock Island County, Illinois?

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

How do I pay Rock Island County, Illinois property taxes?

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

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Rock Island 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

Rock Island County Treasurer

How to Pay

Online

Pay using credit card or e-check

By Mail

Mail check payable to Rock Island 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 Rock Island County

Rock Island County is a county located in the U.S. state of Illinois, bounded on the west by the Mississippi River. According to the 2020 census, it had a population of 144,672. Its county seat is Rock Island; its largest city is neighboring Moline.

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

Related Resources

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