Fort Salonga is a hamlet and census-designated place (CDP) in Suffolk County, New York on the North Shore of Long Island. As of the 2010 United States Census, the CDP population was 10,008. The name evolved from the Revolutionary War British Fort Salonga, or Fort Slongo, (named after one of the fort’s architects) once located near the border of the towns of Huntington and Smithtown, overlooking Long Island Sound.