At this time, we do not have a projected time for processing Certificates of Error related to property valuation, but rest assured our team is working to process them as soon as possible. If your Certificate of Error for valuation corrections has been approved and you are waiting for a refund, please check with the Cook County Treasurer’s Office for updates on timing of refunds. At this time, valuation Certificates of Error are not being refunded. Check this alert banner for regular updates.
Holiday Observance
In observance of Casimir Pulaski Day our offices will be closed Monday, March 2, 2026. We will resume normal operations on Tuesday, March 3, 2026.
Markham Branch Office Closure
Effective Monday, September 22, 2025, the Cook County Assessor’s Office located inside the Markham Courthouse will be closed for remodeling until further notice. For appointments or assistance, please visit our website to book at a nearby branch.
Homeowners: Please review the bottom left corner of your tax bill to confirm your exemption savings. If you are missing an exemption, submit an online application immediately or schedule an appointment at one of our offices for assistance.
A reminder for WWII veterans, disabled veterans, and their families to apply for available property tax savings. The 2025 exemption applications will be opening soon. Please share this information with your family, friends, and neighbors!
Cook County Homeowners Saved $1.9 Billion Under Fritz Kaegi’s Reforms, University of Chicago Study Finds
A study was published by the University of Chicago that found our Office has made great progress in improving the fairness of residential assessments. We encourage you to read the study and learn about the changes we’ve made to improve residential assessments.