10) Mercer Island
Yet another geographical member of King County, Mercer Island is located in the Seattle metro upon Lake Washington. Mercer Island is the most heavily populated fresh water island in the nation with over 25,000 residents in just 6.32 square land miles. There are six schools that can be found on the island alone, with even more in development. Popular Mercer Island activities for families and adults include but are not limited to fishing, swimming, outdoor exploration at local parks and beaches, dog parks, basketball, tennis, softball, bicycling, hiking, and several great bars and restaurants featuring live entertainment. The island also enjoys the annual fourth of July event known as the Summer Celebration. Mercer Island is the fifth wealthiest city in the state of Washington with an average per capita income of over $74,000 per year.
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