Sioux Falls is the most populous city in the U.S. state of South Dakota and the 121st-most populous city in the United States. It is the county seat of Minnehaha County and also extends into northern Lincoln County to the south, which continues up to the Iowa state line. The population was 192,517 at the 2020 census, and in 2022, its estimated population was 202,078. According to city officials, the estimated population had grown to 213,891 as of early 2024.