The number of mass shootings around the country in 2018 saw a slight decrease from 2017.
According to data from the Gun Violence Archive, a total of 340 mass shooting incidents occurred in 2018.
In 2017, the U.S. saw a total of 346 mass shootings. See statistics for other years here.
There doesn't seem to be an official definition for a "mass shooting" in the United States, but according to the Gun Violence Archive, a mass shooting is described as four or more individuals being shot or killed in the same general time and location.
The F.B.I. defines a "mass killing" as the killing of three or more people in a public place, but the federal agency also defines a "mass murderer" as someone who has killed four or more people in the same location.
The Gun Violence Archive lists itself as a not-for-profit organization that documents gun violence and gun crime nationally.