When are property taxes due in Adams County, Illinois?

Adams 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 Adams County, Illinois?

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

How do I pay Adams County, Illinois property taxes?

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

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Adams County Property Tax Due Date

Illinois

(217) 277-2245

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

Adams County Treasurer

Phone

(217) 277-2245

How to Pay

Online

Pay using credit card or e-check

Visit Website →

By Mail

Mail check payable to Adams County Treasurer

Visit Website →

In Person

Visit the Treasurer's office

Visit Website →

Other Counties in Illinois

Alexander Bond Boone Brown Bureau Calhoun Carroll Cass

View all Illinois counties →

About Adams County

Adams County is the westernmost county in the U.S. state of Illinois. As of the 2020 United States census, the population was 65,737. Its county seat is Quincy.

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

Related Resources

CountyRollCounty Office Directory

Find the assessor, treasurer & recorder for Adams

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Property Tax FAQ Tax Calendar

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We'll email you 336 hours 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.