The Sioux City MSA is a tri-state community with one of the strongest business climates in the nation. Our metropolitan statistical area consists of Woodbury and Plymouth County, Iowa; Dakota and Dixon County, Nebraska and Union County, South Dakota. Since 1990, the population of the Sioux City MSA has grown by 8.9%. The largest city in Siouxland is Sioux City, Iowa which has a population of approximately 83,000.