Cook County 10-digit parcels with attached distances to various spatial features.

When working with 10-digit Parcel Index Numbers (PINs) make sure to zero-pad them to 10 digits. Some datasets may lose leading zeros for PINs when downloaded. 10-digit PINs do not identify individual condominium units.

Additional notes:

• Centroids are based on Cook County parcel shapefiles.


• Older properties may be missing coordinates and thus also missing attached spatial data (usually they are missing a parcel boundary in the shapefile).


• Attached spatial data does NOT all go back to 2000. It is only available for more recent years, primarily those after 2012.


• Data for the current tax year may not be complete or final. PINs can still be added and removed to the universe up until the Board of Review closes appeals.


• Data will be updated annually as new parcel shapefiles are made available.


• Rowcount and characteristics for a given year are final once the Assessor has certified the assessment roll for all townships.

For more information on the sourcing of attached data and the preparation of this dataset, see the Assessor's data architecture repo on GitLab.

A brief outline of the changes users can expect from the Assessor's open data offerings.