Assessor - Parcel Sales
Parcel sales for real property in Cook County, from 1999 to present. The Assessor's Office uses this data in its modeling to estimate the fair market value of unsold properties.
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.
Sale document numbers correspond to those of the Cook County Clerk, and can be used on the Clerk's website to find more information about each sale.
NOTE: These sales are filtered, but likely include non-arms-length transactions - sales less than $10,000 along with quit claims, executor deeds, beneficial interests are excluded. While the Data Department will upload what it has access to semi-monthly, sales are reported on a lag, with many records not populating until months after their official recording date.
Current property class codes, their levels of assessment, and descriptions can be found on the Assessor's website (pdf) and in this class code dictionary (csv). 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.
See additional datasets in the Assessor's Open Data Catalog.
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Complete Metadata
| @type | dcat:Dataset |
|---|---|
| accessLevel | public |
| contactPoint |
{ "fn": "Cook County Assessor's Office Data Department", "@type": "vcard:Contact", "hasEmail": "mailto:no-reply@datacatalog.cookcountyil.gov" } |
| description | Parcel sales for real property in Cook County, from 1999 to present. The Assessor's Office uses this data in its modeling to estimate the fair market value of unsold properties. 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. Sale document numbers correspond to those of the Cook County Clerk, and can be used on the <a href="https://ccrd.cookcountyclerkil.gov/i2/default.aspx">Clerk's website</a> to find more information about each sale. NOTE: These sales <i>are</i> filtered, but likely include non-arms-length transactions - sales less than $10,000 along with quit claims, executor deeds, beneficial interests are excluded. While the Data Department will upload what it has access to semi-monthly, sales are reported on a lag, with many records not populating until months after their official recording date. Current property class codes, their levels of assessment, and descriptions can be found <a href="https://prodassets.cookcountyassessoril.gov/s3fs-public/form_documents/classcode.pdf">on the Assessor's website (pdf)</a> and <a href="https://github.com/ccao-data/data-architecture/blob/master/dbt/seeds/ccao/ccao.class_dict.csv">in this class code dictionary (csv)</a>. 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 <a href="https://github.com/ccao-data/wiki/blob/master/SOPs/Open-Data.md">Assessor's Standard Operating Procedures for Open Data</a> on GitHub. See additional datasets in the <a href="https://datacatalog.cookcountyil.gov/stories/s/gzdr-q7c4">Assessor's Open Data Catalog.</a> |
| distribution |
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| identifier | https://datacatalog.cookcountyil.gov/api/views/wvhk-k5uv |
| issued | 2025-02-13 |
| keyword |
[ "cook county assessor", "property tax" ] |
| landingPage | https://datacatalog.cookcountyil.gov/d/wvhk-k5uv |
| modified | 2026-11-01 |
| publisher |
{ "name": "datacatalog.cookcountyil.gov", "@type": "org:Organization" } |
| theme |
[ "Property & Taxation" ] |
| title | Assessor - Parcel Sales |
