Atlantic Highlands is a borough in Monmouth County in the U.S. state of New Jersey, in the Bayshore Region. As of the 2020 United States census, the borough's population was 4,414, an increase of 29 from the 2010 census count of 4,385, which in turn reflected a decline of 320 from the 4,705 in the 2000 census. Atlantic Highlands contains Mount Mitchill, the highest point on the eastern seaboard south of Maine, rising 266 feet above sea level.