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 unfiltered and include non-arms-length transactions. While the Data Department will upload what it has access to 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. Note that class codes details can change across time.

Read about the Assessor's 2022 Open Data Refresh.

Data and Resources

Field Value
accessLevel public
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catalog_@id https://datacatalog.cookcountyil.gov/data.json
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier https://datacatalog.cookcountyil.gov/api/views/wvhk-k5uv
issued 2022-05-31
landingPage https://datacatalog.cookcountyil.gov/d/wvhk-k5uv
modified 2022-07-01
publisher datacatalog.cookcountyil.gov
resource-type Dataset
source_datajson_identifier true
source_hash a89cfeb01cc5b15775ab5379f331a9065011051f
source_schema_version 1.1
theme {"Property & Taxation"}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • ckan
  • cook-county-assessor
  • geo
  • geoss
  • national
  • north-america
  • property-tax
  • united-states
isopen False
license_id notspecified
license_title License not specified
maintainer Cook County Assessor's Office Data Department
maintainer_email no-reply@datacatalog.cookcountyil.gov
metadata_created 2025-11-21T12:22:00.422199
metadata_modified 2025-11-21T12:22:00.422202
notes 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 are unfiltered and include non-arms-length transactions. While the Data Department will upload what it has access to 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.cookcountyassessor.com/s3fs-public/form_documents/classcode.pdf">on the Assessor's website</a>. Note that class codes details can change across time. <a href="https://datacatalog.cookcountyil.gov/stories/s/i22y-9sd2">Read about the Assessor's 2022 Open Data Refresh.</a>
num_resources 4
num_tags 10
title Assessor - Parcel Sales