Datasets
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Programmatic Access
Overview of how to access Open Data resources programmatically (via API, OData, etc.) -
Public Health Birth Data
An overview of published Public Health birth data and changes that have been made since 2000 -
Do I Need an Account?
A reference table indicating what actions require a user to have an Open Data account to complete. -
How To Use Open Data
Overview of Cook County's Open Data site, including what users need an account to access and links out to detailed guides -
Campaign Contributions - Restricted Contractors
Under Cook County Ethics Code Section 2-585, campaign contributions to County elected officials are limited to $1,500 per calendar year if the contributor is currently doing or... -
Procurement - Awarded Contracts & Amendments
Click on the link to see or download a PDF of the contract. This dataset contains new contracts and amendments. Amendments may be contract extensions, renewals, increases,... -
About Open Data
History and principles behind Open Data and its managing department -
Assessor - Parcel Universe (Current Year Only)
A current-year-only universe of Cook County parcels with attached geographic, governmental, and spatial data. When working with Parcel Index Numbers (PINs) make sure to zero-pad... -
Assessor - Parcel Universe
A complete, historic universe of Cook County parcels with attached geographic, governmental, and spatial data. When working with Parcel Index Numbers (PINs) make sure to zero-... -
Creating Visualizations
Step-by-step guide on how to create visualizations from Open Data resources -
Medical Examiner - Unclaimed Persons
This dataset contains our most up to date list of Unclaimed Persons found in Cook County. If you feel you are the next of kin to any of the individuals listed, Please contact... -
Other Open Data Resources
Overview of state and municipality open data resources, separate from Cook County -
Medical Examiner Indigent Cremations
The following page lists the unclaimed indigents cremated by the Cook County Medical Examiner’s Office. -
Contact Us
Tips for finding resources and a feedback form for Open Data -
Medical Examiner Case Archive
Effective April 1, 2022, the Cook County Medical Examiner’s Office no longer takes jurisdiction over hospital, nursing home or hospice COVID-19 deaths unless there is another... -
Procurement - Intent to Execute
This dataset provides the list of vendors and contracts to be executed by the Office of the Chief Procurement Officer and is updated 3 days before award. M/W/DBE Participation... -
Comptroller - Annual Salaries - 2015 - November 24
Annual salaries paid to employees by the Cook County Comptroller as of November 24, 2015. This dataset does not include salaries for Cook County Forest Preserves. This dataset... -
Filtering Datasets
Step-by-step guide for how to filter datasets -
Procurement - Bid Tabulations
The bid tabulations provided herein are preliminary and are for informational purposes only. The purpose of providing this preliminary information is to improve process... -
Cook County Municipalities with City Hall Addresses and URLs
Cook County is home to over 130 municipalities. This dataset lists each of those municipalities along with their websites and city hall locations