About Long Valley
Long Valley is an unincorporated community and census-designated place located within Washington Township, in Morris County, New Jersey, United States. Known as German Valley from its foundation during the colonial era, the community was renamed in response to anti-German sentiment during World War I. As of the 2010 United States Census, the CDP's population was 1,879.
According to the United States Census Bureau, the CDP had a total area of 4.623 square miles, including 4.566 square miles of land and 0.057 square miles of water.
There are several bodies of water, including several man-made lakes used for agriculture and a portion of the Raritan River that are not reflected in the calculation of water area. Much of Long Valley is part of Schooley's Mountain, a tall ridge that contrasts greatly with the rest of the region.