About This Place
Mount Sinai 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°56′19″N 73°01′07″W / 40.938532°N 73.018668°W / 40.938532; -73.018668 (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 km2 (5.7 mi2). Of this figure, 13.6 km2 (5.3 mi2) is land and 1.0 km2 (0.4 mi2) of it (6.89%) is water. Mount Sinai is bordered by Port Jefferson, Port Jefferson Station, Miller Place, and Coram.
The glaciers from the north deposited sediments that now make up the foundation of Long Island. As the global climate warmed, melting ice and flowing waters eroded the dropped glacial sediments into the shape of a land called "Pamanouk" or the island we call Long Island. The island's northern bluffs were interrupted by several rivers and a number of harbors. One of these is now Mount Sinai Harbor.