Mount Sinai, NY has a population of 12,362 and is the 3,333rd largest city in the United States. The population density is 2,061 per sq mi which is 474% higher than the New York average and 2175% higher than the national average. The median age in Mount Sinai is 41 which is approximately 8% higher than the New York average of 38. In Mount Sinai, 71% of the population over 15 years of age are married, 85% speak English and 9% speak Spanish. 83% of Mount Sinai residents were born in New York, 8% were born out of state, 1% were born outside of the United States and 9% were foreign born.