The shootings that generate the most attention occur in the places we go: stores, schools, parks, restaurants, theaters, houses of worship. But most mass killings with guns — shootings in which four or more people are killed, not counting the shooter — take place where we live.

Of the 464 mass killings with guns that have occurred since 2006 in the United States, 303 took place in homes, according to a database maintained by the Associated Press, USA Today and Northeastern University.

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How often do mass shootings happen?

What do we know about the shooters?

How common are other types of mass killings?

Shooters often kill people who are, or presumably once were, close to them. 25 percent killed a parent, child or stepchild, and 23 percent killed a current or former romantic partner. Even some large mass shootings include the killing of a family member in private the same day.

The Sandy Hook shooter, for instance, killed his mother in her bedroom before driving to the school in Newtown, Conn. It was classified as a school shooting because if an incident takes place in multiple locations, the location with the most victims is recorded. When multiple locations involve the same number of victims, the first location is used.

These deadly shootings have occurred in nearly every type of community across 47 states and D.C. since 2006. The two states with the largest populations have had the most: California, 55, followed by Texas, 48.