Sioux City, Iowa is the largest city in the state of Iowa. It is located in the northwest corner of the state and is the county seat of Woodbury County. The city was founded in 1854 and has a population of 82, 684 as of the 2010 census. Sioux City's state is Iowa, which is represented by the four-letter abbreviation IOWA. Iowa is a Midwestern state bordered by Minnesota, South Dakota, Nebraska, and Missouri. It is known for its rolling hills, agricultural production, and manufacturing industries.