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This is a Non-Federal dataset covered by different Terms of Use than

Assessor [Archived 05-31-2023] - Parcel Universe

Metadata Updated: September 15, 2023

A complete, historic universe of Cook County parcels with attached geographic, governmental, and spatial data.

When working with Parcel Index Numbers (PINs) make sure to zero-pad them to 14 digits. Some datasets may lose leading zeros for PINs when downloaded.

Additional notes:Data is attached via spatial join (st_contains) to each parcel's centroid. 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). Newer properties may be missing a mailing or property address, as they need to be assigned one by the postal service. Attached spatial data does NOT go all the way back to 1999. It is only available for more recent years, primarily those after 2012. The universe contains data for the current tax year, which 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 monthly. Rowcount and characteristics for a given year are final once the Assessor has certified the assessment roll for all townships. Depending on the time of year, some third-party and internal data will be missing for the most recent year. Assessments mailed this year represent values from last year, so this isn't an issue. By the time the Data Department models values for this year, those data will have populated. 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. Due to decrepencies between the systems used by the Assessor and Clerk's offices, tax_district_code is not currently up-to-date in this table. For more information on the sourcing of attached data and the preparation of this dataset, see the Assessor's data architecture repo on GitLab.

Read about the Assessor's 2022 Open Data Refresh.

Access & Use Information

Public: This dataset is intended for public access and use. Non-Federal: This dataset is covered by different Terms of Use than License: No license information was provided.

Downloads & Resources


Metadata Created Date May 26, 2022
Metadata Updated Date September 15, 2023

Metadata Source

Harvested from cookcountyil json

Additional Metadata

Resource Type Dataset
Metadata Created Date May 26, 2022
Metadata Updated Date September 15, 2023
Data First Published 2023-01-21
Data Last Modified 2023-05-31
Category Property & Taxation
Public Access Level public
Metadata Context
Metadata Catalog ID
Schema Version
Catalog Describedby
Harvest Object Id 5a6c8a36-41e9-4c84-ae79-150883b5b9ad
Harvest Source Id d52781fd-51ef-4061-9cd2-535a0afb663b
Harvest Source Title cookcountyil json
Homepage URL
Source Datajson Identifier True
Source Hash ab27d7089a28732a6b101b36f91c29e8460368eb4247459ba25a24aff8725cf8
Source Schema Version 1.1

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