Assessor - Property Tax-Exempt Parcels

Additional notes: Parcel entroids are based on Cook County parcel shapefiles . Newer properties may be missing a mailing or property address, as they need to be assigned one by the postal service. Exempt status for parcels changes regularly depending on the use and owner of a given parcel.

Please contact Assessor.Exempt@cookcountyil.gov if you need additional information about parcels excluded from this dataset. Data will be updated semi-monthly. This dataset contains data for the current tax year, which may not yet be complete or final.

Assessed values and property tax-exempt status for any given year are subject to change until review and certification of values by the Cook County Board of Review , though there are a few rare circumstances where values may change for the current or past years after that. Rowcount for a given year is final once the Assessor has certified the assessment roll all townships. Current property class codes, their levels of assessment, and descriptions can be found on the Assessor's website .

Note that class codes details can change across time. For more information on the sourcing of attached data and the preparation of this dataset, see the Assessor's Standard Operating Procedures for Open Data on GitHub. Read about the Assessor's 2025 Open Data Refresh.