Grassy Key, Florida
Island in the middle Florida Keys.
It is located on U.S. 1 (or the Overseas Highway), at approximately 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.
It is one of the northernmost islands in a chain of islands that comprise the City of Marathon, Florida. The island or "key" as the islands are called in parts of Florida hosts many mom n' pop type family resorts - oceanside and bayside, as well as many private residences, although the key is sparsely populated in comparison to the original City of Marathon "proper" farther south. The entire key was incorporated into the City of Marathon in 1999.
The Dolphin Research Center is a dolphinarium located in Grassy Key at mile marker 59.