This dataset is updated nightly. For extended information about Lobbyist Activities in Cook County IL, visit the Cook County Clerk's Lobbyist search: http://lobbyist.cookcountyclerk.com/Public/SearchHome.aspx

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.

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.

Annual Tax Sale: A yearly auction of delinquent taxes where a tax buyer (purchaser) pays the delinquent taxes due on a parcel. This results in a lien on the property. The property owner must repay the tax buyer with interest for the amount of the sale – this is known as “redemption.” If redemption does not occur within a set time period, the tax buyer can obtain legal title to the property – this is referred to as a “tax deed.”

By ordinance, the investigations and considerations by the Board of Ethics of potential violations of the Ethics Ordinance are confidential. County Code, § 2-592. As a matter of policy, the Board also maintains as confidential the identity of the requestors of advisory opinions. Board of Ethics Rules & Regulations, § 4.10. The Board, however, is undertaking to make its final determinations available to the public with such deletions as may be necessary to prevent disclosure of any information the Board determines to be confidential.

Updated periodically--Click on the link to see or download a .pdf of material related to the contract.

New check register data can be found at https://datacatalog.cookcountyil.gov/id/gywr-fjeh. This register contains checks from December 2006 through November 2013. This dataset will not be updated.