Elmsford, NY has a population of 4,814 and is the 6,627th largest city in the United States. The population density is 4,662 per sq mi which is 1200% higher than the New York average and 5046% higher than the national average. The median age in Elmsford is 37 which is approximately 3% lower than the New York average of 38. In Elmsford, 50% of the population over 15 years of age are married, 49% speak English and 39% speak Spanish. 50% of Elmsford residents were born in New York, 7% were born out of state, 1% were born outside of the United States and 42% were foreign born.