Omaha is the most populous city in the U.S. state of Nebraska and the county seat of Douglas County. It is located in the Midwestern United States along the Missouri River, about 10 mi (15 km) north of the mouth of the Platte River. The nation's 40th-most populous city, Omaha had a population of 486,051 as of the 2020 census. It is the anchor of the eight-county Omaha–Council Bluffs metropolitan area, which extends into Iowa and is the 58th-largest metro area in the United States, with a population of 967,604. Furthermore, the greater Omaha–Council Bluffs–Fremont combined statistical area had 1,004,771 residents in 2020.