Mercer Island

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. The population was 22,720 at 2013 Estimate from Office of Financial Management.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.
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