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Grassy Key, Florida, is an island in the middle Florida Keys. It is located on U.S. 1 (or the Overseas Highway), near mile markers 57—60, below the Conch Keys. It has an area of 3.65 km², with a population of 974 as of the census 2000. The Dolphin Research Center is a dolphinarium located in Grassy Key at mile marker 59.