Omaha is the largest city in the state of Nebraska and the county seat of Douglas County. Omaha is located in the Midwestern United States on the Missouri River, about 10 miles (15 km) north of the mouth of the Platte River. Omaha is the anchor of the eight-county, bi-state Omaha-Council Bluffs metropolitan area. The nation's 40th-largest city, Omaha's 2017 estimated population was 466,893. The Omaha Metropolitan Area is the 59th largest in the United States, with an estimated population of 933,316 (2017).The Omaha-Council Bluffs-Fremont, NE-IA Combined Statistical Area (CSA) encompasses the Omaha-Council Bluffs MSA as well as the separate Fremont, NE Micropolitan Statistical Area, which consists of the entirety of Dodge County, Nebraska. The total population of the CSA was 970,023 based on 2017 estimates. Approximately 1.3 million people reside within the Greater Omaha area, comprising a 50 mi (80 km) radius of Downtown Omaha.