Sioux FallsSioux Falls
city in SE S.Dak.
Origin of Sioux Fallsnamed for the falls on the Big Sioux River, on which it is situated
A city of southeast South Dakota on the Big Sioux River north of Sioux City, Iowa. First settled c. 1856, it was destroyed in the Sioux uprising of 1862 and reestablished as a military post in 1865. It is now the largest city in the state.