This heat map shows a snapshot of home addresses, by ZIP code, of Cook County Jail detainees who self-identified as living with mental illness on Jan. 29, 2015. The map is created in collaboration with Christine Watcher from the Chicago Reporter and published  on the Reporter.

Notes: The darker the color red on the map, the higher the number of detainees who reported having a mental illness. Some ZIP codes on the edges of Cook County spill into adjacent counties.

Source: Cook County Sheriff’s Office