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.
Cook County Assessor's Office Data Department