East Rocky Hill, New Jersey
East Rocky Hill is an unincorporated community and census-designated place (CDP) located in Franklin Township, in Somerset County, New Jersey, United States. As of the 2010 United States Census, the CDP's population was 469. Geography. According to the United States Census Bureau, East Rocky Hill had a total area of 4.252 square miles (11.014 km), including 4.165 square miles (10.788 km) of land and 0.087 square miles (0.226 km) of water (2.05%).