US Mass Shootings, 1982-2012: Data From Mother Jones' Investigation
The full data set from our in-depth investigation into mass shootings. Plus: additional cases from 2013-15.
Update, June 18, 2015: In the aftermath of the mass shooting at a historic black church in Charleston, South Carolina, which left nine dead, we've updated this database with three additional cases: two from 2014, and the attack in Charleston. (Other recent public shooting attacks, such as the rampage in April 2014 at Fort Hood, and a shooting on a bridge in Wisconsin in May 2015, have not been included because there were fewer than four victims killed in each of those cases. For more about that distinction, see this piece.)
Update, September 16, 2013: Twelve people were killed and eight others injured in a mass shooting at the Washington Navy Yard on Monday. The incident is the fifth mass shooting in the US this year. Details of the additional cases from 2013 are included on our mass shootings map and in our our full data set below.
Since we began our investigation into mass shootings following the attack in Aurora, Colorado, in July 2012, we've heard from numerous readers, academic researchers, legislative aides, law enforcement officials, and others wanting access to our full data set. Here it is below, including links to sources where available. You can also download this data in CSV, XLS, or TXT formats, or click here for the full Google spreadsheet view. (The embedded version below does not support expanding the cells to see the full text in some places, but you can access it these other ways.)
Update, February 13, 2013: We've dug up additional information on the shooters' weapons, now reflected in the data set below. More details and our updated analysis are in this story. For additional context and analysis from the investigation, click here, and for our full special report on gun laws, the NRA, and mass shootings, click here.