Sioux Falls is the most populous city in the U.S. state of South Dakota and the 118th-most populous city in the United States. It is the county sea…Sioux Falls is the most populous city in the U.S. state of South Dakota and the 118th-most populous city in the United States. It is the county seat of Minnehaha County and also extends into northern Lincoln County. The population was 192,517 at the 2020 census, and in 2023, its estimated population was 206,410. According to city officials, the estimated population had grown to 219,588 as of early 2025. The Sioux Falls metro area accounts for more than 30% of the state'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.
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