Bellevue is a city in Sarpy County, Nebraska, United States and a southern suburb of Omaha. The population was 50,137 at the 2010 census. Bellevue is part of the Omaha-Council Bluffs metropolitan area. Originally settled in the 1830s, Bellevue was incorporated in 1855 and is the oldest continuous town in Nebraska. The Nebraska State Legislature has credited the town as being the second oldest settlement in Nebraska. It was once the seat of government in Nebraska.