Dakota County, Nebraska

Dakota County is a county in the U.S. state of Nebraska. As of the 2020 census, the population was 21,582, and it was estimated to be 21,687 in 2025. The county seat is Dakota City and the largest city is South Sioux City.

Dakota County is part of the Sioux City metropolitan area.

In the Nebraska license plate system, Dakota County was represented by the prefix "70" (as it had the 70th-largest number of vehicles registered in the state when the license plate system was established in 1922). In August 2009, the Dakota County Board of Commissioners reversed a decision to abandon this system for alphanumeric plates upon introduction of new license plates in 2011. Douglas, Lancaster, and Sarpy Counties remain the only counties with alphanumeric plates in the state.