List of mass shootings in the United States in 2019  This is a list of mass shootings in the United States that have occurred in 2019. Mass shootings are incidents involving multiple victims of firearm-related violence. The precise inclusion criteria are disputed, and there is no broadly accepted definition. 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. The Congressional Research Service narrows that definition, limiting it to "public mass shootings", and defined by four or more victims killed. It excludes counting wounded survivors. "The Washington Post" and "Mother Jones" use similar definitions, with the latter acknowledging that their definition "is a conservative measure of the problem", as shootings with fewer fatalities occur. The crowdsourced Mass Shooting Tracker project defines a mass shooting as "an incident where four or more people are shot in a single shooting spree. This may include the shooter themself, or police shootings of civilians around the shooter." There were 434 mass shootings in 2019 that fit the inclusion criteria of this article. This averaged 1.19 mass shootings per day. In these shootings, 1,643 people were injured and 517 died, for a total of 2,160 victims. There are many definitions of a mass shooting. Listed roughly from broad to specific:  Only incidents considered mass shootings by at least two of the above sources are listed below. The statistics columns for each month are updated after the month ends, in an effort to make sure the correct number of events, individuals affected, and descriptions are accurate. Thus, the number may be incomplete throughout the month until the last day of each month. According to data compiled by the "Associated Press", "USA Today", and "Northeastern University", the year 2019 saw the highest number of mass killings recorded to date: 211 killed in 41 incidents. Thirty-three of these mass killings, defined here as four or more people killed excluding the perpetrator, involved firearms.