High Quality Content by WIKIPEDIA articles! Delaware Township is a Township in Hunterdon County, New Jersey, United States. Part of the township is on the Hunterdon Plateau, while the southern portions are in the Amwell Valley. As of the 2010 United States Census, the township population was recorded as 4,563. The historic community of Sergeantsville is located within Delaware Township, as is the unincorporated area of Raven Rock. Other villages are Croton, Locktown, Sand Brook, and Rosemont.