Roslyn Heights, NY has a population of 6,899 and is the 5,235th largest city in the United States. The population density is 4,673 per sq mi which is 1203% higher than the New York average and 5058% higher than the national average. The median age in Roslyn Heights is 39 which is approximately 1% higher than the New York average of 38. In Roslyn Heights, 61% of the population over 15 years of age are married, 61% speak English and 13% speak Spanish. 64% of Roslyn Heights residents were born in New York, 5% were born out of state, 2% were born outside of the United States and 29% were foreign born.