Named after the Mercer family of Seattle, this island in the middle of Lake Washington was first settled between 1870-1880. In 1928, the East Channel Bridge was built connecting the island to Bellevue in the East. This was followed by the Lacey V Murrow Memorial Bridge in 1940, which today remains the second longest floating bridge in the world. The island is home to some of the most stunning lots in King County, with many homes featuring incredible views of Lake Washington, the Cascades and Mt. Rainier to the South.