Mount Sinai is a quiet residential community covering an area of approximately six square miles.  While most of the land is privately owned, the Town of Brookhaven owns and manages the common lands of Mount Sinai Harbor and Cedar Beach.  Here there are facilities for boating, fishing and many other recreational activities.
Mt. Sinai is a combination of historic houses and newer developments built on former farmland.  They are both scattered among the rolling, curving roads surrounded by mature trees.  With a strong emphasis on education, for the past several years, the Mount Sinai School District has been recognized as one of the top 20 in New York State.