Inclusion criteria for MotherJones.com database: Follman, Mark; Aronsen, Gavin; Pan, Deanna. A Guide to Mass Shootings in America. MotherJones.com (2012). Archived from the original on March 10, 2023. "Updated March 27, 2023": "In July 2012, in the aftermath of the movie theater massacre in Aurora, Colorado, Mother Jones created a first-of-its-kind open-source database documenting mass shootings in the United States. Our research focused on indiscriminate rampages in public places resulting in four or more victims killed by the attacker. We exclude shootings stemming from more conventionally motivated crimes such as armed robbery or gang violence. (Or in which the perpetrators have not been identified.) Other news outlets and researchers have since published larger tallies that include a wide range of gun crimes in which four or more people have been either wounded or killed. While those larger datasets of multiple-victim shootings are useful for studying the broader problem of gun violence, our investigation provides an in-depth look at a distinct phenomenon—from the firearms used and mental health factors to the growing copycat problem. Tracking mass shootings is complex; we believe ours is the most useful approach for studying this specific phenomenon."
Data source is continually updated. Because 2023 was not ended, I (uploader) omitted 2023 numbers from Version 1 (31 March 2023).
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Chart showing deaths from mass shootings in the U.S., including 5-year moving average, beginning in 1982
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