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County dataCourts & Justice
Initiation
Published by Cook County State's Attorney's Office · Updated 04/02/2026 · As needed
- Last updated
- 04/02/2026
- First published 05/05/2022
- Update frequency
- As needed
- Formats
- 3
- CSV, JSON, XML
- Coverage
- Cook County, Illinois
- County in Illinois
About this dataset
This dataset is no longer actively maintained as of 12/30/2024. Please visit the site below to explore data dashboards published by the State’s Attorney’s Office beginning 2025.
Data Dashboards | Cook County State's Attorney
The Initiation results data presented here reflects all of the arrests that came through the door of the State's Attorneys Office (SAO). An initiation is how an arrest turns into a “case” in the courts. Most cases are initiated through a process known as felony review, in which SAO attorneys make a decision whether or not to prosecute. Cases may also be indicted by a grand jury or, in narcotics cases, filed directly by law enforcement (labeled "BOND SET (Narcotics)" in this data). Included in this data set are the defendant counts by initiation and year. This data includes felony cases handled by the Criminal, Narcotics, and Special Prosecution Bureaus. It does not include information about cases processed through the Juvenile Justice and Civil Actions Bureaus.
Files and access
Links open the official government source
- CSV downloaddatacatalog.cookcountyil.govCSV
- JSON (SODA API)datacatalog.cookcountyil.govJSON
- XMLdatacatalog.cookcountyil.govXML
API endpoint: https://datacatalog.cookcountyil.gov/resource/7mck-ehwz.json
Links open outside websites we do not control.
Frequently asked questions
- Who publishes Initiation?
- Cook County State's Attorney's Office, part of Cook County, Illinois, publishes this dataset on Cook County Open Data.
- How often is it updated?
- The publisher lists the update frequency as as needed. The last update was on 04/02/2026.
- How do I download it?
- It is available as CSV, JSON, XML. Use the links in Files and access, which open the official government source.
Where this catalog comes from
- Data.gov CatalogU.S. General Services Administration
- State and local open data portalsSocrata Discovery API
- State and city CKAN portalsCalifornia, Virginia, Boston, Houston and more
- Government ArcGIS Hub sitesCity and county GIS data
Catalog checked 10/29/2026
We list dataset descriptions only. Downloads and APIs link straight to the official government source, which holds the current version and its terms of use.
Source: Cook County Open Data and Data.gov · Last updated 10/29/2026 · Listing only; the data stays with the publisher
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