The Parcel 2014 feature contains tax parcel polygons for the 2014 property tax assessment at the County. This feature reflects tax parcel polygons as they existed from 1/1/2014 through 12/31/2014. Each parcel is uniquely identified with a Property Index Number (PIN).

This contains information about deaths that occurred in Cook County that were under the Medical Examiner’s jurisdiction. Not all deaths that occur in Cook County are reported to the Medical Examiner or fall under the jurisdiction of the Medical Examiner. The Medical Examiner’s Office determines cause and manner of death for those cases that fall under its jurisdiction. Cause of death describes the reason the person died. This dataset includes information from deaths starting in August 2014 to the present, with information updated daily.

Mortgages recorded with the Cook County Recorder of Deeds. Data covers 2013 through March 27, 2015. This dataset will be updated Quarterly. For more information see http://cookrecorder.com/ .

Update 10/31/2023: Sales are no longer filtered out of this data set based on deed type, sale price, or recency of sale for a given PIN with the same price. If users wish to recreate the former filtering schema they should set sale_filter_same_sale_within_365, sale_filter_less_than_10k, and sale_filter_deed_type to False.

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 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.

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.

2012 budget request detail.

Scavenger Tax Sale: A sale held every two years by the Treasurer selling taxes on property with 2 or more years of delinquent taxes.

Cook County GIS Department map of Cook County Commissioner Districts in PDF format. Includes major streets, waterbodies, rail, and Cook County Commissioner District boundaries.

This Municipality feature class interprets the location and describes the boundaries of all municipalities and unincorporated areas within the borders of Cook County. Attribution for this feature class includes a municipality name and agency description.