With a combined population of 145,000 plus, Siouxland is a tri-state region merged into one community cooperating across geographic lines in economic development, planning, marketing, education and legislative issues.

The Siouxland area consists primarily of six communities including three counties, which converge at the point where the Big Sioux River flows into the Missouri River. City government includes: Sioux City and Sergeant Bluff, Iowa; South Sioux City and Dakota City, Nebraska; Dakota Dunes and North Sioux City, South Dakota. County government includes Woodbury County in Iowa, Union County in South Dakota, and Dakota County in Nebraska.