Bellevue, Washington (Wikipedia) Bellevue (/ˈbɛlvjuː/ BEL-vew) is a city in the Eastside region of King County, Washington, United States, located across Lake Washington from Seattle. It is the third-largest city in the Seattle metropolitan area and has variously been characterized as a satellite city, a suburb, a boomburb, or an edge city. Its population was 122,363 at the 2010 census and 151,854 in the 2020 census. The city’s name is derived from the French term belle vue (“beautiful view”).