Haflinger Horses for Sale near Hillsdale, NJ

About Hillsdale, NJ

For the unincorporated community in Monmouth County, see Hillsdale, Monmouth County, New Jersey. Hillsdale is a borough in the New York City metropolitan area in Bergen County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 10,219, reflecting an increase of 132 (+1.3%) from the 10,087 counted in the 2000 Census, which had in turn increased by 337 (+3.5%) from the 9,750 counted in the 1990 Census. The populated area today known as Hillsdale took form in the mid-to-late 19th century as land speculators, led by David P. Patterson, developed subdivisions to profit from the coming of the Hackensack and New York Railroad (later New Jersey and New York Railroad).