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is a hamlet and census-designated place (CDP) in Suffolk County, New York, USA. The population was 8,734 at the 2000 census.
Mount Sinai is located at (40.938532, -73.018668), bordering the Long Island Sound on the north shore of Long Island. According to the United States Census Bureau, the community has a total area of 14.7 km
). Of this figure, 13.6 km
) of it (6.89%) is water. Mount Sinai is bordered by Port Jefferson, Port Jefferson Station, Miller Place, and Coram.