Vashon-Maury Island, usually known as Vashon Island, is Puget Sound's largest island south of Admiralty Inlet. Part of unincorporated King County, Washington, it had a total population of 10,123 as of the 2000 census. At 37 square miles, it is about 10 percent larger in area than Manhattan, with about 1/150 the population. Vashon is locally known for its liberal politics. Vashon apartments for rent comparison page shows most up to date rent information on Vashon apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.