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Mass Shootings in the U.S. (2013-2015)

According to a report released by the FBI in 2014, mass shootings in the United States (U.S.) have been increasing since 2000. The FBI reports that an average of 11.4 incidents occurred annually between 2000-2013. These shootings occurred in forty out of the fifty states and the District of Columbia. The FBI defines a “mass shooting” as any event that leads to the death of four or more people. The Mass Shooting Tracker aims to contest this definition by including mass shootings that lead to shooting of four or more people as well.

This Silk aims to explore mass shootings in the U.S. between 2013-2015 by using data from the Mass Shooting Tracker, a crowdsourced database.


How to Use This Silk: Browse the charts and maps below. Use the filters to customize the information shown. Click "Explore" anywhere on the site to go into visualization mode. Here you can change the type of chart, the variables plotted, and the filter options. When you see or create a graph you like, you can share it in a few clicks on social media. Or even embed the (responsive) graphs online in your blogs and articles. Search for individual pages or entities in the top search box.


Last Updated: August 14, 2015.

According to data collected from the Mass Shootings Tracker, 2013 was the deadliest year for mass shootings. An estimated 502 people died and over 1,200 were wounded. These numbers present mass shootings by both identified and unidentified shooters. 

Total Casualties and Injuries (2013-2015)

Total Killed and Total Wounded of Year of Mass Shooting (2013-2015) datacards
Page Title
Total Killed
Total Wounded
20135021266
20143491026
2015285820

Deadliest Mass Shootings (2013-2015)

The graphs below presents the deadliest mass shootings, in terms of the number of people killed or injured. 

Deadliest mass shootings in terms of number of people killed 
Deadliest mass shootings in terms of number of people injured

The deadliest mass shootings between 2013-2015, in terms of the number of people killed, occurred in 2013 when 34-year-old Aaron Alexis, a government contractor, killed 13 people inside the Navy Yard in Washington, D.C. The second deadliest mass shooting occurred in 2015 when 21-year-old Dylann Roof killed nine people inside a church in Charleston, South Carolina. The third deadliest shooting, on May 18, 2015, took place at the Twin Peaks restaurant in Waco, Texas. The mass shooting, which left 9 people dead and 18 injured, is still under investigation. The incident led to the detention of 239 people at the crime scene, only 62 of them were released without charge.  




The top-2 deadliest shootings, in terms of the number of injuries, were carried out by unknown perpetrators. The third deadliest mass shooting occurred on April 2, 2014 when a 34-year-old Ivan Lopez, an Army Specialist, killed three people and injured 16 others before killing himself. In another case, 18-year-old Randy Stewart carried out a mass shooting in a house party––killing two people and injuring 16 others. 

Mass Shootings Mapped

Map of mass shootings between 2013-2015 with over four casualties.





This map shows mass shootings between 2013-2015 that led to over four deaths in total. The deadliest shootings within those years led to more than half a dozen deaths. In 2013, 34-year-old Aaron Alexis, a government contractor, killed 12 people inside the Navy Yard in Washington, D.C. In 2014, 51-year-old Don Charles Spirit killed his daughter and six grandchildren in Florida before killing himself. In 2015, 21-year-old Dylann Roof killed nine people inside a church in Charleston, South Carolina.

State Statistics 

Death count from mass shootings, per capita (per million), show several outlier states including California, Texas, Florida, and New York. 

Death count per capita, according to each state's recorded population in 2014 

States with the highest number of casualties from mass shootings, total of 2013-2015

Identity of Shooters

Data gathered from the Mass Shootings Tacker demonstrates that the majority of mass shootings between 2013-2015 were carried out by unidentified shooters and an estimated 29.4%, were carried out by established or alleged shooters. Less than 2% of shootings were carried out by known but undisclosed shooters.

Overview of mass shootings between 2013 and mid-2015, graphed by identity of shooter. 


Location of Mass Shootings (2000-2013)

Study of 160 mass shooting incidents (2000-2013), graphed by location of occurrence.  





The Mass Shootings Tacker doesn't discuss which the type of location in which these mass shootings occur. But a 2014 FBI report on mass shootings in the U.S. (2000-2013) investigated the location of 160 mass shooting cases that led to the death of four or more people. Data showed that the majority of mass shootings during those years took place of commerce or educational institution.



Mass shootings with alleged or established shooters (2013-2015).