New City is a hamlet and census-designated place in the town of Clarkstown, Rockland County, New York, United States, part of the New York Metropolitan Area. An affluent suburb of New York City, the hamlet is located 18 miles north of the city at its closest point, Riverdale, Bronx. Within Rockland County, New City is located north of Bardonia, northeast of Nanuet, east of New Square and New Hempstead, south of Garnerville and Haverstraw village, and west, straight across Lake DeForest, of Congers. New City's population was 33,559 at the 2010 census, making it the 14th most populous CDP/hamlet in the state of New York.New City is the county seat, and most populous community of Rockland County and the location of the Clarkstown Police Department, Sheriff's office and corrections facility. The downtown area is one of the main business districts in the county. The ZIP code of New City is 10956.