Introduction: Mass shootings, defined as incidents where 4 or more people are shot with a firearm, have become a significant public health concern in the US.
Objective: To estimate the prevalence of direct exposure to mass shootings among US adults and identify the sociodemographic groups most affected.
Design, Setting, And Participants: A survey was administered in January 2024 to a sample of 10 000 respondents (18 years or older) designed to be representative of US adults using a multistage matched sampling design.