Shelter Island, NY has a population of 1,453 and is the 12,885th largest city in the United States. The population density is 222 per sq mi which is 46% lower than the New York average and 145% higher than the national average. The median age in Shelter Island is 47 which is approximately 24% higher than the New York average of 38. In Shelter Island, 80% of the population over 15 years of age are married, 86% speak English and 12% speak Spanish. 77% of Shelter Island residents were born in New York, 13% were born out of state, 1% were born outside of the United States and 9% were foreign born.