Mercer Island is a city in King County, Washington, United States located on an island of the same name in the southern portion of Lake Washington. Mercer Island is in the Seattle metropolitan area,^[1] with Seattle located to its west and Bellevue located to its east.

Mercer Island is connected to the mainland on either side via bridges carrying Interstate 90.

The population was 25,748 at the 2020 census.^[2] This makes Mercer Island the most populated island in a lake within the United States.^[3]

• Mercer Island Reporter Local newspaper

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