High Quality Content by WIKIPEDIA articles! 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 (-6.8%) from the 4,705 counted in the 2000 Census, which had in turn increased by 76 (+1.6%) from the 4,629 counted in the 1990 Census.