Mattituck, NY has a population of 4,686 and is the 6,750th largest city in the United States. The population density is 521 per sq mi which is 45% higher than the New York average and 475% higher than the national average. The median age in Mattituck is 50 which is approximately 30% higher than the New York average of 38. In Mattituck, 64% of the population over 15 years of age are married, 90% speak English and 2% speak Spanish. 86% of Mattituck residents were born in New York, 7% were born out of state, 1% were born outside of the United States and 6% were foreign born.