On average, one or more guns is present in about a third of American households, but that figure varies depending on the region.
Watch the video below to see a breakdown of where gun owners live in the United States.
A Pew Research Center report released in 2014 found whites in the South are more likely to own guns than white Americans in any other region.
But gun ownership does not necessarily equate to more incidents of gun violence. The five states with the most mass shootings in 2015 so far are Florida with 23, Illinois with 22, New York with 21, California with 21 and Georgia with 17, according to the Mass Shooting Tracker, a crowd-sourced project by a group of anti-gun social-media users.
The shooting at Umpqua Community College was Oregon’s second mass shooting for the year, by the Mass Shooting Tracker’s standards.