Sioux Falls () (Lakota: Íŋyaŋ Okábleča Otȟúŋwahe; "Stone Shatter City") is the most populous city in the U.S. state of South Dakota and the 140th-most populous city in the United States. It is the county seat of Minnehaha County and also extends into Lincoln County to the south, proximate with the Iowa state line.
As of 2019, Sioux Falls had an estimated population of 183,793. The metropolitan population of 265,653 accounts for 29% of South Dakota's population. Chartered in 1856 on the banks of the Big Sioux River, the city is situated in the rolling hills at the junction of interstates 29 and 90.
According to Best Life magazine, Sioux Falls is the healthiest city in the United States and is often considered one of the healthiest cities in the US by many other organizations.
The history of Sioux Falls revolves around the cascades of the Big Sioux River. The falls were created about 14,000 years ago during the last ice age. The lure of the falls has been a powerful influence. Ho-Chunk, Ioway, Otoe, Missouri, Omaha (and Ponca at the time), Quapaw, Kansa, Osage, Arikira, Dakota, and Cheyenne people inhabited and settled the region previous to Europeans and European descendants. Numerous burial mounds still exist on the high bluffs near the river and are spread throughout the general vicinity.