Deaths by year

Deaths by state

Notes

NOTES

Data and definitions taken from the Gun Violence Archive.

According to the GVA: “Mass Shootings are, for the most part an American phenomenon. While they are generally grouped together as one type of incident they are several with the foundation definition being that they have a minimum of four victims shot, either injured or killed, not including any shooter who may also have been killed or injured in the incident.” (Emphasis added.)
https://www.gunviolencearchive.org/explainer