While the public often searches for a singular profile, the data reveals a disturbingly consistent pattern: mass shooters are overwhelmingly men, often in crisis, who have left a trail of visible warning signs long before their attacks.
Key Takeaways
- Between 1966 and 2019, 96% of mass shooters in public mass shootings were male
- The average age of mass shooters from 1966-2019 was 34.7 years old
- 52% of mass public shooters were white, 20% Black, 8% Latino, and 7% Asian from 1966-2019
- 62% of mass shooters experienced childhood trauma or abuse
- 48% showed signs of clinical depression before attack 1966-2019
- 44% had suicidal thoughts or attempts prior to mass shooting
- 37% of mass shooters had prior arrests for violent crimes
- 48% had documented domestic violence histories
- 54% communicated plans to at least one person before attack
- 73% used handguns as primary weapon in mass shootings 1966-2019
- 26% used semi-automatic rifles
- Average of 9 firearms used per incident 1966-2019
- 85% of incidents occurred in open public spaces like stores or streets 1966-2019
- 12% in schools, 10% workplaces per Violence Project
- Average 12 victims killed in public mass shootings 1966-2019
Public mass shooters are overwhelmingly troubled young men with legal firearms.
Demographics
1Between 1966 and 2019, 96% of mass shooters in public mass shootings were male
Verified2The average age of mass shooters from 1966-2019 was 34.7 years old
Verified352% of mass public shooters were white, 20% Black, 8% Latino, and 7% Asian from 1966-2019
Verified425% of mass shooters were under 21 years old in public incidents 1966-2019
Directional577% of mass shooters had a history of domestic violence or intimate partner issues prior to 2019
Single source6From 1982-2022, 97% of mass shooters were male according to Mother Jones database
Verified748% of mass shooters in Mother Jones database were white males aged 18-35
Verified88% of mass shooters were female from 1982-2022 per Mother Jones
Verified9Average age in Mother Jones mass shootings 1982-2022 was 35 years
Directional1061% of mass shooters had some college education or higher from 1982-2022, Mother Jones
Single source11In FBI active shooter incidents 2000-2013, 96.4% perpetrators were male
Verified1249.3% of active shooters 2000-2013 were white, 20.9% Black per FBI
Verified13Median age of active shooters 2000-2013 was 35 years old, FBI report
Verified1423.9% had criminal records prior to active shooter event 2000-2013, FBI
Directional15Washington Post database shows 64% of mass shooters since 1966 were white
Single source1633% of mass shooters in WaPo tracker were age 18-24 since 1966
Verified176% female mass shooters in WaPo database since 1966
Verified1828% of mass shooters had college education per WaPo analysis
Verified1915% were immigrants or children of immigrants per WaPo mass shootings data
Directional20Gun Violence Archive notes 54% of 2022 mass shooters were 18-30 years old
Single source2191% male in GVA mass shootings 2014-2022
Verified2242% Black perpetrators in GVA 2022 mass shootings
Verified23Average age 29 in GVA 2023 preliminary data
Verified2412% Hispanic mass shooters in GVA database 2014-2023
Directional25Everytown reports 85% of mass shooters 2009-2020 were male
Single source2655% white in Everytown mass shooting analysis 2009-2020
Verified2722% under age 25 per Everytown 2009-2020
Verified2818% had military background per Everytown data
Verified2965% lived with parents or family at time of mass shooting per Everytown
DirectionalDemographics Interpretation
While these numbers on race and age shift depending on the source, the data points with near-universal agreement paint a disturbingly specific—and preventable—profile: mass shooters are overwhelmingly young men who were already a known danger to those closest to them.
Incident Characteristics
185% of incidents occurred in open public spaces like stores or streets 1966-2019
Verified212% in schools, 10% workplaces per Violence Project
Verified3Average 12 victims killed in public mass shootings 1966-2019
Verified461% ended with shooter suicide or killed by police
Directional5Mother Jones: Average 12 deaths per incident 1982-2022
Single source644% in educational settings MJ database
Verified7FBI 2000-2013: 160 incidents, 1043 casualties
Verified840% in commercial areas FBI data
Verified9Washington Post: 4+ killed average 6.5 since 1966
Directional1025% in schools WaPo tracker
Single source11GVA 2022: 636 mass shootings, 813 killed
Verified1279% in homes or residences GVA 2022
Verified13Everytown 2009-2020: 433 incidents, average 7.5 deaths
Verified1431% in public places excluding homes Everytown
Directional15FBI 2000-2019: 277 incidents, 89% stopped by unarmed civilians or police
Single source1634% open areas, 25% schools FBI update
Verified17RAND: Average duration 10 minutes for mass shootings
Verified1855% had multiple locations attacked RAND data
Verified1967% occurred on weekdays Violence Project
Directional20Average 40 wounded per high-fatality incident
Single sourceIncident Characteristics Interpretation
The unsettling mosaic of these statistics paints a picture where, despite the horror being statistically more likely to strike in an open public space on a weekday, our deepest fears are disproportionately shaped by the tragedies in schools and the grim reality that the average incident is over in ten violent minutes, often ending with the shooter's own death.
Mental Health Factors
162% of mass shooters experienced childhood trauma or abuse
Verified248% showed signs of clinical depression before attack 1966-2019
Verified344% had suicidal thoughts or attempts prior to mass shooting
Verified454% leaked plans to others indicating mental distress
Directional577% had crisis points in life like job loss before shooting
Single source6Mother Jones: 44% diagnosed with mental illness
Verified723% of mass shooters in MJ database were on psychiatric meds
Verified835% had history of substance abuse per Mother Jones 1982-2022
Verified9FBI 2000-2013: 25% showed mental health stressors
Directional1013.7% had diagnosed mental illness per FBI active shooter report
Single source1162.3% experienced stress or loss before incident FBI 2000-2013
Verified12Washington Post: 59% had mental health issues documented
Verified1330% received psychiatric treatment prior per WaPo
Verified1442% showed signs of acute crisis like isolation, WaPo data
Directional15GVA notes 38% of 2022 shooters had reported mental health flags
Single source16Everytown: 51% had mental health concerns noted in 2009-2020 cases
Verified1727% had schizophrenia or bipolar diagnoses per Everytown
Verified1839% abused alcohol or drugs before shooting Everytown data
Verified19FBI 2000-2019 update: 40% had mental health red flags ignored
Directional2056% of mass shooters had leaked intent due to mental state
Single source2131% had prior psychiatric hospitalizations FBI 2000-2019
Verified2245% experienced recent trauma like breakup, FBI data
Verified23RAND study: 24% met criteria for serious mental illness
Verified2467% had personality disorders noted in psych evals, RAND
Directional2529% had autism spectrum diagnoses per RAND mass shooter review
Single source2652% reported chronic bullying as mental health factor
Verified2741% had family history of mental illness, Violence Project
VerifiedMental Health Factors Interpretation
While these statistics undeniably reveal a stark and complex portrait of individuals in profound mental and emotional crisis, they serve not as a monolithic excuse but as a critical, flashing map of the systemic failures and personal agonies we must urgently address to prevent these tragedies.
Prior History and Warnings
137% of mass shooters had prior arrests for violent crimes
Verified248% had documented domestic violence histories
Verified354% communicated plans to at least one person before attack
Verified430% had prior police encounters for threats
Directional5Mother Jones: 39% had felony convictions prior to shooting
Single source651% had history of violence against family per MJ database
Verified720% were on probation or parole at time of mass shooting MJ
Verified8FBI 2000-2013: 62.3% had acute stressors including criminal activity
Verified940% had prior illegal gun possession charges FBI data
Directional10Washington Post: 52% had criminal records before mass shooting
Single source1163% showed warning behaviors like threats to others WaPo
Verified1235% had restraining orders filed against them prior, WaPo
Verified13GVA 2022: 46% had prior violent crime arrests
Verified14Everytown: 71% had history of abusive behavior
Directional1543% ignored by law enforcement after reports Everytown 2009-2020
Single source16FBI 2000-2019: 71% had leaked plans or shown attack warnings
Verified1725% had involuntary commitments prior FBI update
Verified18RAND: 55% had prior assaults documented
Verified1928% gang affiliated with prior crimes RAND data
Directional2049% had school disciplinary records for violence
Single source2132% reported to authorities but not acted upon, Violence Project
VerifiedPrior History and Warnings Interpretation
The chilling truth behind the numbers is that, long before becoming infamous, most mass shooters were already known as dangerous men who broadcast their intent and terrorized those around them, revealing a devastating pattern of missed opportunities and systemic failures.
Weapons and Armaments
173% used handguns as primary weapon in mass shootings 1966-2019
Verified226% used semi-automatic rifles
Verified3Average of 9 firearms used per incident 1966-2019
Verified468% used legally purchased guns
Directional5Mother Jones: 47% used assault weapons or high-capacity mags
Single source657% handguns only in MJ database 1982-2022
Verified724% rifles primary per Mother Jones
Verified8FBI 2000-2013: 73.9% handguns used
Verified928.4% rifles in FBI active shooter incidents
Directional10Washington Post: 59% semi-auto handguns since 1966
Single source1131% AR-15 style rifles in WaPo tracker
Verified12GVA 2022: 82% handguns in mass shootings
Verified1315% rifles used in GVA 2023 data
Verified14Everytown: 81% handgun primary 2009-2020
Directional1522% high-capacity magazines over 10 rounds Everytown
Single source16FBI 2000-2019: 76% pistols, 26% rifles used
Verified1718% shotguns in FBI incidents 2000-2019
Verified18RAND: 64% legally obtained firearms
Verified1935% multiple guns carried average 2.5 per shooter RAND
Directional2021% used suppressors or modifications
Single source2145% reloaded during attack indicating high-capacity, Violence Project
VerifiedWeapons and Armaments Interpretation
Despite the frenzied cultural fixation on "assault rifles," the sobering, bureaucratic reality of mass shootings is that they are overwhelmingly executed with the most common firearm—the handgun—often legally purchased, frequently multiple, and chillingly efficient in its capacity to inflict carnage.
Sources & References
- Reference 1THEVIOLENCEPROJECTtheviolenceproject.orgVisit source
- Reference 2MOTHERJONESmotherjones.comVisit source
- Reference 3FBIfbi.govVisit source
- Reference 4WASHINGTONPOSTwashingtonpost.comVisit source
- Reference 5GUNVIOLENCEARCHIVEgunviolencearchive.orgVisit source
- Reference 6EVERYTOWNRESEARCHeverytownresearch.orgVisit source
- Reference 7RANDrand.orgVisit source