Key PointsQuestionIs the Gun Violence Archive, an independent data collection group, a valid source of data for community firearm violence, including firearm homicide and nonfatal shootings that result from interpersonal violence?FindingsIn this cross-sectional study of data from 4 US cities (Philadelphia, Pennsylvania; New York, New York; Chicago, Illinois; and Cincinnati, Ohio) from 2015 to 2020, the overall sensitivity of community firearm violence shooting events in the Gun Violence Archive was 81.1%.MeaningThe findings may support the use of the Gun Violence Archive in large cities for research requiring its unique advantages, albeit with caution regarding granular examination of epidemiology given systematic biases.