2026 Property Tax Due Dates
Varies (Cook Co.: March 1)
First installment (varies by county)
Varies (Cook Co.: August 1)
Second installment
Payment Methods
Online, Mail, In-Person
Cook County Treasurer
How to Pay
Online
Pay using credit card or e-check
By Mail
Mail check payable to Cook County Treasurer
In Person
Visit the Treasurer's office — 118 N Clark St, Room 112, Chicago IL 60602, Mon-Fri 8:30am - 5pm
Other Counties in Illinois
About Cook County
Cook County is the most populous county in the U.S. state of Illinois and the second-most-populous county in the United States, after Los Angeles County, California. More than 40 percent of all residents of Illinois live within Cook County. As of 2020, the population was 5,275,541.
Source: Wikipedia — content available under CC BY-SA 4.0
Related Resources
Get Deadline Reminders
We'll email you a fortnight 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.