The Washington Post and Mother Jones use similar definitions, with the latter acknowledging that their definition "is a conservative measure of the problem", as many rampages with fewer fatalities occur. The Congressional Research Service narrows that definition further, only considering what it defines as "public mass shootings", and only considering victims as those who are killed, excluding any victims who survive. The Gun Violence Archive, a nonprofit research group that tracks shootings and their characteristics in the United States, defines a mass shooting as an incident in which four or more people, excluding the perpetrator(s), are shot in one location at roughly the same time.
Detailed lists of mass shootings can be found per year at their respective pages. Only shootings that have Wikipedia articles of their own are included in this list. The precise inclusion criteria are disputed, and there is no broadly accepted definition. Mass shootings are incidents involving several victims of firearm-related violence. This is a list of the most notable mass shootings in the United States that have occurred since 1920.
Class=notpageimage| Mass shootings in the Northern Mariana Islands
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