Ramapo is a town in Rockland County, New York, United States. It was originally formed as New Hampstead, in 1791, and became Ramapo in 1828. It shares its name with the Ramapo River. As of the 2010 census, Ramapo had a total population of 126,595. If Ramapo were incorporated as a city, it would be the sixth-largest city in the state of New York.