South Sioux City is a city in Dakota County, Nebraska, United States. It is located immediately across the Missouri River from Sioux City, Iowa, and is part of the Sioux City, IA-NE-SD Metropolitan Statistical Area. As of the 2010 census, the city population was 13,353, making it the 14th most populous city in Nebraska.

Dakota County is a county in the U.S. state of Nebraska. As of the 2020 United States Census, the population was 21,582. Its county seat is Dakota City.