There were nearly 1700 tornadoes recorded in the United States alone in 2011 and many more worldwide. In total the world saw 65 killer tornadoes that year (of which 59 were in the U.S.) that resulted in a total of 570 deaths (of which 553 were in the U.S). The deadliest of these tornadoes was the one which struck Joplin, Missouri, Killing 158 people.
Here are the killer tornadoes of 2011, arranged by date. Tornadoes with 20 or more deaths are in bold.
February 28
March 5
April 4
April 5
April 14
April 15
April 16
April 25
April 27
May 7
May 10
May 21:
May 22
May 24
June 1
August 2
August 10
August 19
August, 21
October 2
November 16
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No tornado hit Joplin, Missouri in 2012. However, Joplin was devastated by an EF5 tornado on May 22, 2011. That tornado directly killed 158 people, the deadliest to hit the U.S. since 1947. Three or four other people died due to indirect effects.
Three people died in the Kirksville, Missouri tornado that struck on April 27, 1899.
The 2010 Mississippi tornado outbreak resulted in a total of 10 fatalities.
There have been many tornadoes in Arkansas. However, given the timing, you presumeably mean the tornado that struck the towns of Mayflower and Vilonia on April 27, 2014. That tornado killed 16 people.
The Joplin tornado killed 158 people. The City of Joplin has a population of about 50,000 and the tornado destroyed about 1/3 of the city. So that means about 17,000 were impacted by the tornado, nearly all of whom survived.