Here is a list of the deadliest single day mass shootings in US history from 1949 to the present.
If the shooter was killed or died by suicide during the incident, that death is not included in the total.
Fort Hood shootings
Violence in society
Crime, law enforcement and corrections
Crimes against persons
Sandy Hook School Shooting
Weapons and arms
Aurora theater shooting
Universities and colleges
Virginia Polytechnic Institute and State University
2015 Charleston church shooting
Southeastern United States
2015 Oregon college shooting
Deaths and fatalities
Northwestern United States
2015 San Bernardino shooting
International relations and national security
Southwestern United States
Terrorism and counter-terrorism
Unrest, conflicts and war
Law and legal system
2016 Orlando nightclub shooting
Trial and procedure
2017 Las Vegas concert shooting
History and historical discoveries
2017 Texas church shooting
2018 Parkland school shooting
2018 Maryland school shooting
Northeastern United States
2018 Texas Santa Fe school shooting
2018 Pittsburgh synagogue attack
Continents and regions
Humanities and social sciences
Racism and racial discrimination
2018 California Thousand Oaks bar shooting
58 killed - October 1, 2017 - In Las Vegas, 64-year-old Stephen Paddock of Mesquite, Nevada, sprays gunfire on a crowd of 22,000 concertgoers from the 32nd floor of the Mandalay Bay Resort and Casino, killing 58 people and injuring almost 500. Witnesses say the gunshots last between 10 and 15 minutes. Officers breach Paddock's hotel room to find him dead. Authorities believe Paddock killed himself and that he acted alone.
49 killed - June 12, 2016 - Omar Saddiqui Mateen, 29, opens fire inside Pulse, a gay nightclub, in Orlando. At least 49 people are killed and more than 50 are injured. Police shoot and kill Mateen during an operation to free hostages officials say he was holding at the club.
32 killed - April 16, 2007 - Virginia Tech in Blacksburg, Virginia. A gunman, 23-year-old student Seung-Hui Cho, goes on a shooting spree killing 32 people in two locations and wounding an undetermined number of others on campus. The shooter dies by suicide.
27 killed - December 14, 2012 - Sandy Hook Elementary School - Newtown, Connecticut. Adam Lanza, 20, guns down 20 children, ages six and seven, and six adults, school staff and faculty, before turning the gun on himself. Investigating police later find Nancy Lanza, Adam's mother, dead from a gunshot wound.
25 and an unborn child killed - November 5, 2017 - A gunman opens fire on a small church in Sutherland Springs, Texas, killing 25 people and an unborn child and wounding 20 others. The shooter, identified by two law enforcement sources as Devin Patrick Kelley, is found dead after a brief chase, but it's unclear if it was self-inflicted.
23 killed - October 16, 1991 - In Killeen, Texas, 35-year-old George Hennard crashes his pickup truck through the wall of a Luby's Cafeteria. After exiting the truck, Hennard shoots and kills 23 people. He dies by suicide.
21 killed - July 18, 1984 - In San Ysidro, California, 41-year-old James Huberty, armed with a long-barreled Uzi, a pump-action shotgun and a handgun, shoots and kills 21 adults and children at a local McDonald's. A police sharpshooter kills Huberty one hour after the rampage begins.
18 killed - August 1, 1966 - In Austin, Texas, Charles Joseph Whitman, a former US Marine, kills 16 and wounds at least 30 at the University of Texas while shooting from a tower. Police officers Ramiro Martinez and Houston McCoy shoot and kill Whitman in the tower. Whitman had also killed his mother and wife earlier in the day.
17 killed - February 14, 2018 - A former student unleashes a hail of gunfire at Marjory Stoneman Douglas High School in Parkland, Florida, killing at least 17 adults and children. Nikolas Cruz, 19, has been charged with 17 counts of premeditated murder.
14 killed - December 2, 2015 - Married couple Syed Rizwan Farook and Tashfeen Malik open fire on an employee gathering taking place at Inland Regional Center in San Bernardino, California, killing 14 people.
14 killed - August 20, 1986 - In Edmond, Oklahoma, Patrick Henry Sherrill, a part-time mail carrier armed with three handguns, kills 14 postal workers in 10 minutes and then takes his own life.
13 and an unborn child killed - November 5, 2009 - Maj. Nidal Malik Hasan kills 13 people and one unborn child and injures 32 at Fort Hood, Texas, during a shooting rampage. He is convicted and sentenced to death.
13 killed - April 3, 2009 - In Binghamton, New York, Jiverly Wong kills 13 people and injures four during a shooting at an immigrant community center. He then kills himself.
13 killed - April 20, 1999 - Columbine High School - Littleton, Colorado. Eighteen-year-old Eric Harris and 17-year-old Dylan Klebold kill 12 fellow students and one teacher before dying by suicide in the school library.
13 killed - February 18, 1983 - Three men enter the Wah Mee gambling and social club in Seattle, rob the 14 occupants and then shoot each in the head, killing 13. Two of the men, Kwan Fai Mak and Benjamin Ng, are convicted of murder in August 1983. Both are serving life in prison. The third, Wai-Chiu "Tony" Ng, after years on the run in Canada, is eventually convicted of first-degree robbery and second-degree assault. He is deported to Hong Kong in 2014.
13 killed - September 25, 1982 - In Wilkes-Barre, Pennsylvania, 40-year-old prison guard George Banks kills 13 people including five of his own children. In September 2011, the Pennsylvania Supreme Court overturns his death sentence, stating that Banks is mentally incompetent.
13 killed - September 5, 1949 - In Camden, New Jersey, 28-year-old Howard Unruh, a veteran of World War II, shoots and kills 13 people as he walks down Camden's 32nd Street using a German-crafted Luger pistol. He is found insane and is committed to a state mental institution. He dies at the age of 88.
12 killed - November 7, 2018 - Twelve people are killed in a shooting at the Borderline Bar & Grill in Thousand Oaks, California. Officials say the gunman, Ian David Long, shot an unarmed security guard outside the bar, then went in and continued shooting, injuring other security workers, employees and patrons.
12 killed - September 16, 2013 - Shots are fired inside the Washington Navy Yard, killing 12. The shooter, identified as Aaron Alexis, 34, is also killed.
12 killed - July 20, 2012 - Twelve people are killed, and 58 are wounded in a shooting at a screening of the new Batman film in Aurora, Colorado. James E. Holmes, 24, dressed head-to-toe in protective tactical gear, sets off two devices of some kind before spraying the theater with bullets from an AR-15 rifle, a 12-gauge shotgun and at least one of two .40-caliber handguns police recovered at the scene. On July 16, 2015, Holmes is found guilty on all 165 counts against him, 24 first-degree murder, 140 attempted murder and one count of possession or control of an explosive or incendiary device. He is sentenced to life in prison without parole.
12 killed - July 29, 1999 - In Atlanta, 44-year-old Mark Barton kills his wife and two children at his home. He then opens fire in two different brokerage houses, killing nine people and wounding 12. He later kills himself.
11 killed - October 27, 2018 - Eleven people are killed in a shooting at the Tree of Life synagogue in the Squirrel Hill neighborhood of Pittsburgh, PA. 46-year-old Robert Bowers surrendered to authorities on the third floor of the building and is now facing federal charges, including hate crimes. Bowers told told a SWAT officer while receiving medical care that he wanted all Jews to die and that Jews "were committing genocide to his people," a criminal complaint filed in Allegheny County says.
10 Killed - May 18, 2018 - Dimitrios Pagourtzis, 17, allegedly walks into an art class and begins firing, killing 8 students and 2 teachers at Santa Fe High School in Santa Fe, Texas. Pagourtzis is arrested and charged with capital murder and aggravated assault of a public servant.
10 killed - March 10, 2009 - In Alabama, Michael McLendon of Kinston, kills 10 and himself. The dead include his mother, grandparents, aunt and uncle.
9 killed - October 1, 2015 - Gunman Christopher Sean Harper-Mercer shoots and kills nine people, injuring another nine, at Umpqua Community College in Roseburg, Oregon. The shooter dies after a gun battle with police at the college. Six weapons were recovered at the school; another seven were recovered at Harper-Mercer's home.
9 killed - June 17, 2015 - Dylann Roof, 21, shoots and kills nine people inside the historic Emanuel African Methodist Episcopal Church, in Charleston, South Carolina. Eight die at the scene; a ninth dies at a hospital. Roof is arrested the following day; according to police, he confesses and tells investigators he wanted to start a race war. Roof is convicted of hate crimes in federal court and is sentenced to death and later convicted of murder in state court.
9 killed - March 21, 2005 - Red Lake High School, Red Lake, Minnesota. Sixteen-year-old Jeff Weise kills his grandfather and another adult, five students, a teacher and a security officer. He then kills himself.
9 killed - August 10, 1991 - Six monks, a nun, a monk in training and a temple worker are found shot to death at Wat Promkunaram, a Buddhist temple in Waddell, Arizona. Johnathan Doody, 17, and Alessandro Garcia, 16, are later convicted of the crime and receive multiple life sentences.
9 killed - June 18, 1990 - In Jacksonville, Florida, 42-year-old James Pough, angry about his car being repossessed, opens fire at a General Motors Acceptance Corp. office, killing nine people. Pough takes his own life.
8 killed - October 12, 2011 - Eight people are killed during a shooting at the Salon Meritage in Seal Beach, California. The suspect, Scott Evans Dekraai, 41, of Huntington Beach, is arrested without incident as he is trying to leave the scene. The eight victims include Dekraai's ex-wife, Michelle Fournier, 48. He is armed with three guns -- a 9 mm Springfield, a Smith & Wesson .44 Magnum, and a Heckler & Koch .45 -- and is wearing body armor during the shooting rampage. After a delay of several years due to allegations of prosecutorial misconduct, Dekraai is sentenced on September 22, 2017, to eight consecutive terms of life in prison without parole, plus an additional term of 232 years to life for attempted murder.
8 killed - August 3, 2010 - Manchester, Connecticut - Omar Thornton kills eight co-workers at Hartford Distributors before turning the gun on himself. Thornton had been asked to resign for stealing and selling alcoholic beverages.
8 killed - January 19, 2010 - Christopher Speight, 39, kills eight people at a house in Appomattox, Virginia. He surrenders to police at the scene the next morning. In February 2013, he is sentenced to five life terms plus 18 years.
8 killed - March 29, 2009 - In Carthage, North Carolina, 45-year-old Robert Stewart kills a nurse and seven elderly patients at a nursing home. In May, the Moore County district attorney announces she will seek the death penalty. On September 3, 2011, a jury finds Stewart guilty of second-degree murder. Stewart is sentenced to 141 to 179 years in prison.
8 killed - December 5, 2007 - In Omaha, Nebraska, 19-year-old Robert Hawkins goes to an area mall and kills eight shoppers before killing himself.
8 killed - July 1, 1993 - In San Francisco, 55-year-old Gian Luigi Ferri kills eight people in a law office and then kills himself.
8 killed - September 14, 1989 - In Louisville, Kentucky, 47-year-old Joseph Wesbecker, armed with a AK-47 semiautomatic assault rifle, two MAC-11 semiautomatic pistols, a .38 caliber handgun, a 9-millimeter semiautomatic pistol and a bayonet kills, eight co-workers at Standard Gravure Corporation and then kills himself. He had been placed on disability leave from his job due to mental problems.
8 killed - August 20, 1982 - In Miami, Carl Robert Brown, 51, kills eight people with a shotgun at a machine shop. Brown, a teacher, was reportedly angry about a repair bill from the shop. After fleeing the scene on a bicycle, he is fatally shot by a witness who pursues him.