Mercer Island, WA
Mercer Island is a city in King County, Washington, United States and the name of the island in Lake Washington on which the city sits. The population was 22,699 at the 2010 census.
Located in the Seattle Metropolitan Area, it is the most populated island in a lake within the United States. The ZIP code 98040 is unique to Mercer Island.
Mercer Island, named for the Mercer family of Seattle, was first settled between 1870 and 1880. The Mercer brothers often rowed between the island and Seattle to pick berries, hunt, and fish. The first large settlement, East Seattle, was toward the northwest side of the island—near the McGilvara neighbourhood. During 1889, a C C Calkins built a large and gilded resort, the Calkins Hotel. The Hotel was patronised via steamboat between: Madison Park, Leschi Park, and the Eastside. Burnt by a mysterious fire, the Hotel was razed during 1908.