The Data-Driven CCSAO

"Our work must be grounded in data and evidence, and the public should have access to that information.” —SA Foxx

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The Cook County State’s Attorney’s Office (CCSAO), the second-largest prosecutor’s office in the country, prosecutes tens of thousands of criminal cases every year across more than 100 law enforcement jurisdictions in service of the five million residents of Cook County. Despite a clear vested interest, the public has not historically had access to meaningful information about the details and outcomes of this hugely consequential work.

When she took office in December 2016, State’s Attorney Foxx affirmed her commitment to changing that dynamic: Both the CCSAO’s work and public conversations about criminal justice can only be credible and effective when informed by data rather than anecdotes — and the CCSAO has an obligation to develop that data and facilitate understanding. Read a message from State's Attorney Foxx about her commitment here.

Open Data

A core component of the CCSAO's commitment to data transparency under State's Attorney Foxx is the regular release of case-level datasets containing anonymized information about every felony case processed by the CCSAO (dating back to roughly 2010). Divided into four categories by stages of interaction with the CCSAO — Intake, Initiation, Sentencing, and Disposition — these datasets, containing tens of millions of data points and representing hundreds of thousands of distinct cases, provide an unobstructed view of the CCSAO's work on behalf of the taxpayers of Cook County.

Felony Dashboard

In addition to the unmatched transparency of regular releases of detailed case-level data, the State's Attorney Foxx and the CCSAO Data Team seek to make that information accessible and understandable for the community as a whole, without needing advanced technical expertise. The felony cases dashboard offers broad descriptions and summaries of the information contained in the casel-level datasets.

Sexual Assault and Domestic Violence

The CCSAO Dashboards are tools created by the CCSAO Data Team to provide context and explanation of felony domestic violence and sexual assault data:

Hacking 4 Justice

In September 2018, the CCSAO piloted the Hacking 4 Justice (H4J) workshop series for community members interested in learning how to analyze and interpret the CCSAO's case-level datasets; the CCSAO Data Team now supports H4J as an independent partnership. Learn about upcoming H4J trainings and sign up to participate at

(Hacking for Justice, 2019)

Data Updates — find a log of the latest updates from the SAO Data Team

The CCSAO Data Team

Pursuing an unprecedented data transparency agenda started with hiring the CCSAO's first-ever Chief Data Officer, Matthew Saniie, who joined the Office in 2017. In addition to the case-level datasets and annual Data Reports, Matthew is responsible for leading the CCSAO’s ongoing effort to increase prosecutorial transparency and innovation in the criminal justice system.

If you are interested in working with the CCSAO on quantitative research that depends on more, or different, data than the case-level datasets provide, please Submit a Data Request using this form.  Other inquiries about data transparency at the CCSAO can be directed to