New City is a hamlet, in the Town of Clarkstown Rockland County, New York, United States. The area is located north of Bardonia; northeast Nanuet; east of New Hempstead and New Square; southeast of Mount Ivy; south of Garnerville; southwest of Haverstraw; west, straight across Lake Deforest, of Congers; and northwest, diagonally across Lake Deforest, of Valley Cottage. New City's population was 34,038 at the time of the 2000 census, making it one of the most populous CDP/hamlet in the state of New York. New City is the county seat of Rockland County and the location of the Clarkstown Police Department. It is also the most populous community in Rockland County. The ZIP Code of New City is 10956.