*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sources: Chicago Tribune, Chicago Sun-TimesHomicide Watch Chicago, DNAInfo Chicago, Chicago Redeye Homicide Tracker (no longer updated), NBC5 Chicago, Chicago Tribune’s Shooting Tracker & Homicide Tracker, CPD’s Historical Data Set, City of Chicago Data Portal and CPD CLEARMAP.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 count homicides, whereas the CPD counts murders. A homicide, or a non-fatal shooting, regardless of type or by whom, within the city limits of Chicago counts towards our total metric, including anything on the expressways. 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.