Sioux Falls () (Lakota: "Íŋyaŋ Okábleča Otȟúŋwahe"; "Stone Shatter City") is the most populous city in the U.S. state of South Dakota and the 139th-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 2020, Sioux Falls had an estimated population of 195,850. The Sioux Falls metro area accounts for more than a quarter of the state's entire 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.