Cold Spring Harbor, NY has a population of 5,055 and is the 6,426th largest city in the United States. The population density is 1,380 per sq mi which is 285% higher than the New York average and 1423% higher than the national average. The median age in Cold Spring Harbor is 46 which is approximately 19% higher than the New York average of 38. In Cold Spring Harbor, 66% of the population over 15 years of age are married, 86% speak English and 4% speak Spanish. 77% of Cold Spring Harbor residents were born in New York, 11% were born out of state, 0% were born outside of the United States and 11% were foreign born.