At this time, we do not have a projected time for the completion of processing Certificates of Error related to property valuation. Our staff 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. Check this alert banner for regular updates.
The Cook County Assessor’s Office is committed to sharing data about your community. You can find our data releases here, as well as tools you can use to better understand property assessments and their role in Cook County’s property tax system.
Assessment Data
You can download the characteristics data used to estimate the values of Cook County homes.
