 In 1840, the portions of Harrington Township west of the Hackensack River were taken away to create Washington Township.At that point, Harrington Township was somewhat in the form of a square measuring about on each side, bounded on the north by Rockland County, New York; east by the Hudson River, south by Hackensack Township and west by the Hackensack River.At that time, Norwood, Northvale (once called Neuvy), Old Tappan, Demarest, Closter and Harrington Park were communities within Harrington Township.