The Tri-State tornado killed 606 people in Illinois.
246 people died in the flood in Illinois of 2011
The deadliest tornado in Illinois history was the Tri-State tornado of March 18, 1925. This F5 tornado tore a 219-mile-long damage path across portions of Missouri, Illinois, and Indiana, killing at least 695 people, making it by far the deadliest tornado in U.S. history. A least 606 people died in Illinois.
Tornadoes killed 12 people in Arkansas in 2011.
The Goderich, Ontario tornado of 2011 killed 1 person.
If you mean the Sedalia, Missouri tornado of May 25, 2011, there were no deaths from that particular tornado.
At least 36 people died in the tri-state area of Missouri, Illinois, and Tennessee during the December 10-11, 2021 tornado outbreak.
The tornado that hit Smithville, MS on April 27, 2011 killed 23.
In 2011 tornadoes killed 570 people, 553 in the U.S.
158 people were killed by the Joplin tornado. Another tornado on the same day killed 1 person in the Minneapolis area.
The Tuscaloosa, Alabama tornado of April 27, 2011 killed 64 people, making it the second deadliest tornado in Alabama history. Another tornado hit Tuscaloosa on December 16, 2000, killing 11 people.
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.