Atlantic Highlands is a borough in Monmouth County, New Jersey, in the Bayshore Region. As of the 2010 United States Census, the borough's population was 4,385, reflecting a decline of 320 from the 4,705 counted in the 2000 Census, which had in turn increased by 76 from the 4,629 counted in the 1990 Census.Atlantic Highlands contains Mount Mitchill, the highest point on the eastern seaboard south of Maine, rising 266 feet above sea level. The borough's name comes from its location overlooking the Atlantic Ocean.Atlantic Highlands was incorporated as a borough by an act of the New Jersey Legislature on February 28, 1887, from portions of Middletown Township, based on the results of a referendum held that day. The borough was reincorporated on September 1, 1891.