The data visualization tools below enable different presentations of data regarding the Illinois prison population – they can be limited by date and prison and have different tabs for looking at different variables. These were built from IDOC’s public datasets using the methodology described here. IDOC’s official admissions and recidivism rates are reported in fact sheets publicly available on IDOC’s website. Any errors found in these tools should be attributed to JHA.

• Single deep dive: Allows you to look at different multi-level single variables (e.g., age, sex, race, offense type, etc.) of the IDOC prison population as of a particular date.

• Compare facilities: Allows you to look at the population of a particular IDOC prison compared to the rest of the IDOC population over time.

• Change over time: Allows you to look at the IDOC prison population’s change over time for various variables.

Please let us know how you are using these tools and if you discover any issues we should further examine. If you cite use of this tool in your work, please credit JHA.

JHA would like to recognize and thank Data Scientist Caitlin Van Ort, JHA 2022 Volunteer of the Year, for her extraordinary assistance with this work.