Middle Island, NY has a population of 10,441 and is the 3,824th largest city in the United States. The population density is 1,270 per sq mi which is 254% higher than the New York average and 1302% higher than the national average. The median age in Middle Island is 44 which is approximately 15% higher than the New York average of 38. In Middle Island, 58% of the population over 15 years of age are married, 91% speak English and 3% speak Spanish. 81% of Middle Island residents were born in New York, 8% were born out of state, 2% were born outside of the United States and 9% were foreign born.