Islandia, NY has a population of 3,349 and is the 8,262nd largest city in the United States. The population density is 1,509 per sq mi which is 321% higher than the New York average and 1566% higher than the national average. The median age in Islandia is 42 which is approximately 10% higher than the New York average of 38. In Islandia, 54% of the population over 15 years of age are married, 60% speak English and 26% speak Spanish. 66% of Islandia residents were born in New York, 4% were born out of state, 3% were born outside of the United States and 27% were foreign born.