Mercer Island is a city located in King County, Washington, situated in Lake Washington between the cities of Seattle and Bellevue. Known for its residential neighborhoods, the island offers a suburban feel with parks, schools, and recreational facilities. The island is accessible via the I-90 floating bridge, making it a convenient location for commuters. With a population of around 25,000, Mercer Island is recognized for its strong community, excellent public schools, and scenic views of the surrounding water and mountains.