Marblemount is located at 48°32′17″N 121°26′16″W (48.538154, -121.437844). According to the United States Census Bureau, the CDP has a total area of 2.5 square miles, of which, 2.4 square miles of it is land and 0.1 square miles of it (4.44%) is water. It sits at an elevation of 315 feet above sea level.
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