Beginning on Monday, August 18, 2025 our website domain will be moving from cookcountyassessor.com to cookcountyassessoril.gov. A ".gov" domain is only used by U.S. government entities and will help users verify that we are a government agency. Our website and pages will automatically redirect to the new cookcountyassessoril.gov page.
Message About Certificates of Error Filings
Due to a Countywide technology upgrade, processing of Certificates of Error applications are temporarily on hold. This means that no applications or refunds will be issued at this time. Applications can still be filed, but they will be processed at a later date in the order they were received. When your application is processed, you will receive an email notification with the result. You can also check the status of your application by logging into your account and clicking on “My Filings” on the top of the Page. Login here