Mount sinai is located in Suffolk county New york with a geographic area of 6.0 square miles. The total population in Mount sinai is 10,446 with 49.4% male and 50.6% female. Children under age 5 represent 3.7% of the population, under age 18 equal 20.8% of the population and over age 65 is 25.3% of the population. The median household income is $135,389, per capita income is $53,493. There are a total of 3,691 housing units with 96.7% owner occupied. Education includes 17.4% of residents that are high school graduates and 52.2% with a bachelor's degree or higher. The average temperature in Mount sinai in the summer is 70 degrees, and in the winter 27 degrees.