The county is home to Sioux Falls, the largest town in the state, as well as the county seat. The County is named for a Native American word meaning "laughing water".
Main Highways include I-90, I-29, I-229, SD-11, SD-19, SD-38, SD-42 and SD-115.
It borders Moody, Turner, Lincoln, McCook and Lake Counties in South Dakota, Rock County in Minnesota and Lyon County in Iowa.
Cities
Brandon
Dell Rapids
East Sioux Falls
Garretson
Shindler
Sioux Falls