This is an archive of bid tabulations before June 2016. For current bid tabulations see https://datacatalog.cookcountyil.gov/d/32au-zaqn. The bid tabulations provided herein are preliminary and are for informational purposes only. The purpose of providing this preliminary information is to improve process transparency. The information contained in the preliminary bid tabulations is subject to change pending math review, analysis of all bids, and review of documentation provided.

Bids: All bids estimated at $25,000 or more are publicly opened and read at the time, date, and place specified in the bid document.

RFP/RFQ/RFI: Responses to RFP/RFQ/RFI are not publicly opened. Names of respondents will be made available based on the names identified on the sealed package and is, therefore, subject to change.

This dataset shows what agencies are in a tax code for each tax year along with the agency and tax code rates. Data is updated yearly. For more information on Tax codes and Tax agencies visit the Cook County Clerk's website at: http://www.cookcountyclerk.com/tsd/Pages/default.aspx

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.

This data is compiled by the Cook County Department of Public Health using data from the Illinois Department of Public Health Vital Statistics. It includes the annual number of live births, and birth related outcomes and characteristics. Further analysis is available by birth mother's age group, race/ethnicity, and place/district of residence for all births in suburban Cook County. Also included is data related to infant mortality. Table of Contents and other information can be found at http://opendocs.cookcountyil.gov/docs/Birth_Table_Of_Contents_Data_Portal_fyn8-c3rk.pdf. Note: * Counts suppressed for events between 1 and 4, - Rates not calculated for events less than 20

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/ .

Historic land, building, and total assessed values for all Cook County parcels appealed with the Board of Review, from 2010 to present. The Board of Review uses these values for reporting, evaluating assessment performance over time, and research.

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

This data is parcel-level. Each row contains the assessed values for a single PIN for a single year. Important notes:
• Assessed values are available when the Board of Review closes appeals and certifies the values.
• The values in this data are assessed values, NOT market values. Assessed values must be adjusted by their level of assessment (https://prodassets.cookcountyassessor.com/s3fs-public/form_documents/classcode.pdf) to arrive at market value. Note that levels of assessment may have changed throughout the time period covered by this data set.
• This data set will be updated when each township is certified. However, note that there may be discrepancies between the Board of Review’s data and the Assessor's site and this data set, as each pull from a slightly different system.
• Current property class codes, their levels of assessment, and descriptions can be found on the Assessor's website (https://prodassets.cookcountyassessor.com/s3fs-public/form_documents/classcode.pdf). Note that class codes details can change across time.
• The Change Reason and No Change Reason fields are only populated starting with the 2015 year data.

All data provided here is prepared for internal purposes by the County of Cook only is provided to the public as a courtesy.

While efforts have been made to be as accurate as possible, Cook County provides the data for personal use “as is”. The data is not guaranteed to be accurate, correct, or complete. Information provided should not be used as a substitute for legal, business, tax, or other professional advice. The recipient/viewer should contact appropriate regulating agencies to determine accuracy or suitability of the data for a particular use. This data may not be used in states that do not allow the exclusion or limitation of incidental or consequential damages.

Cook County or its staff assume no liability whatsoever for any losses that might occur from the use, misuse, or inability to use its geospatial data, maps or websites. All materials appearing on a map, geospatial data or County web site are transmitted without warranty of any kind and are subject to the terms on this disclaimer.

A Note from the State's Attorney's Office as of 12/30/2024:

The Cook County State's Attorney's Office believes data transparency is an important accountability and public safety tool and is committed to providing Cook County residents with this critical information. Currently, we are working to make sure that the data we share is valid, accurate, and presented in a format that is useful to the public. Our goal is to have resumed updating the Cook County open data site within the first 100 days of the new administration.

Dataset Description:

The Diversion dataset contains information on defendants who receive a referral to a diversion program, including the type of program and date of referral; each row is a program to which a defendant has been referred.
Please use this link for more instructions and data glossary:
https://www.cookcountystatesattorney.org/resources/how-read-data