*Source Data & Editor’s Note

Posted on January 27, 2013

We compile our own dataset using the following sources: Chicago Tribune, Chicago Sun-TimesHomicide Watch Chicago, DNAInfo Chicago, Chicago Redeye Homicide Tracker(no longer updated), NBC5 Chicago, City of Chicago Data Portal and CPD CLEARMAP.

Community areas and neighborhoods are determined by the Chicago Tribune’s Boundaries App.

Editor’s note: All murders are homicides, but not all homicides are murders. We counts homicides, whereas the CPD counts murders. A homicide, regardless of type or by whom, within the city limits of Chicago counts towards our total metric. CPD-involved, ISP-involved and justifiable homicides all count. Reckless homicides may count if the Medical Examiner rules that the cause of death was a homicide. Suicides do not count. Additional definitions can be found on the Glossary page.