From The Villanovan:

“Below is a list of all mass school shootings in the United States which occurred after the Columbine High School Massacre. Dates and death tolls (excluding the shooter) are included. Although many other mass shootings have occurred,  only shootings involving the death of five or more people have been included in this list.”

Columbine High School Shooting, Littleton, Colorado – April 1999: 13 Dead

Red Lake High School, Red Lake Indian Reservation, Minnesota – March 2005: 9 Dead

West Nickel Mines Amish School, Nickel Mines, Pennsylvania – October 2006: 5 Dead

Virginia Tech University, Blacksburg, Virginia – April 2007: 32 Dead

Northern Illinois University, Dekalb, Illinois – February 2008: 5 Dead

Oikos University, Oakland, California – April 2012: 7 Dead

Sandy Hook Elementary School, Newtown, Connecticut – December 2012: 27 Dead

Santa Monica College, Santa Monica, California – June 2013: 5 Dead

University of California Santa Barbara, Isla Vista, California – May 2014: 6 Dead

Marysville Pilchuck High School, Marysville, Washington – October 2014: 4 Dead

Umpqua Community College, Roseburg, Oregon – October 2015: 9 Dead

Marjory Stoneman Douglas High School, Parkland, Florida – February 2018: 17 Dead