The incidents have stretched from California to Washington, DC, and many have left multiple victims dead, CNN reported.
At least seven mass shootings occurred in the week between the attacks in Atlanta and in a grocery store in Boulder, Colorado. In the week that followed, that number more than doubled.
CNN defines a mass shooting as a shooting incident that results in four or more casualties (dead or wounded), excluding the shooter(s).
March 31: Orange, California
Four people, including a child, were killed and another person wounded in a mass shooting at an office complex in Orange, California, according to authorities.
March 31: Washington, DC
Five people were shot in Washington, the DC Police Department said. The incident started as a dispute and ended with two people dead and three injured.
March 28: Cleveland, Ohio
Seven people were shot at a Cleveland nightclub, according to CNN affiliate WOIO. The victims, four men and three women, were all between 20 and 30 years old, and police believe several shooters fired inside the nightclub, the station reported.
March 28: Chicago, Illinois
Four people in an SUV were shot on the I-57 expressway, according to Illinois State Police. All were taken to hospitals in critical condition.
March 28: Essex, Maryland
A man fatally shot his parents before shooting three people at a convenience store, killing two of them, CNN affiliate WBOC, citing Baltimore County police. The suspect died by suicide.
March 27: Chicago, Illinois
Four people were shot in Chicago's South Austin neighborhood, according to a CNN affiliate. The victims, which included men ages 42, 53 and 64, were all near a sidewalk when they were shot, the station reported.
March 27: Yazoo City, Mississippi
At least seven people were injured in a mass shooting at a nightclub, CNN affiliate WLBT reported. At least six people were shot and another person suffered a laceration, the station reported.
March 27: River Grove, Illinois
A shooting on a party bus left three people injured and one dead, according to CNN affiliate WLS. Police say the occupants of another vehicle fired at the bus while stopped at an intersection, the station reported.
March 26: Virginia Beach, Virginia
Three shootings in the city left eight people injured and two dead, according to the City of Virginia Beach. Officers responded to shots fired and found the eight victims, who were transported to local hospitals with gunshot wounds ranging from serious to life-threatening. Officers heard additional gunshots nearby and found a female victim who died of injuries from gunshot wounds.
The suspected gunman succumbed to his wounds after a related officer-involved shooting, the city said.
March 26: Chicago, Illinois
A gathering in Chicago's Wrightwood neighborhood turned into a mass shooting, according to WLS. Two gunmen opened fire inside the gathering, wounding seven people and fatally shooting a 26-year-old man, the station reported.
March 26: Norfolk, Virginia
Police responded to a shooting that left four people wounded, CNN affiliate WTKR reported. The victims -- two 18-year-old men, a 17-year-old girl and a 21-year-old woman -- sustained non-life-threatening gunshot wounds.
March 26: Memphis, Tennessee
Five people were shot in Memphis, the Memphis Police Department said on Twitter. Three victims were pronounced dead at the scene, two were transported to the hospital in critical condition and one was transported in non-critical condition, the tweet said.
March 26: Philadelphia, Pennsylvania
Outside of the Golf and Social Club, police say two suspects shot seven people, CNN affiliate WPVI reported. Video released by police shows two suspects approaching a gathering crowd and opening fire.
March 23: Aliceville, Alabama
A shooting reported at an Aliceville home left two people dead and two injured, according to CNN affiliate WVTM.
March 23: Boulder, Colorado
Ten people, including a Boulder police officer, were killed in a shooting at the King Soopers supermarket, according to police.
March 20: Philadelphia, Pennsylvania
One person was killed and another five were injured during a shooting at an illegal party, CNN affiliate KYW reported. "There were at least 150 people in there that fled and believed they had to flee for their lives," Philadelphia Police Commissioner Danielle Outlaw said.
March 20: Dallas, Texas
Eight people were shot, one fatally, by an unknown assailant, according to police.
March 20: Houston Texas
Five people were shot after a disturbance inside a club, according to police. One was in critical condition after being shot in the neck, the rest were in stable condition, according to CNN affiliate KPRC.
March 18: Gresham, Oregon
Four victims were taken to the hospital after a shooting in the city east of Portland, police said in an initial report.
March 17: Stockton, California
Five people who were preparing a vigil in Stockton, in California's Central Valley, were shot in a drive-by shooting, the San Joaquin Sheriff's Department said. None had life-threatening injuries.
March 16: Atlanta, Georgia
Eight people, including six Asian women, were killed when a White gunman stormed three spas, police said.
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