Allenhurst is a borough in Monmouth County, New Jersey, United States named for resident Abner Allen and incorporated as a borough by an act of the New Jersey Legislature on April 26, 1897, from portions of Ocean Township. As of the 2010 United States Census, Allenhurst had 496 inhabitants, reflecting a decline of 222 from the 2000 Census, which had in turn declined by 5% from the 1990 Census. Bordered by the Atlantic Ocean to the east and Deal Lake to the west, it is within close proximity to New York City and is a stop on the NJ Transit North Jersey Coast Line. The borough is at the center of a string of wealthy communities between Long Branch and Asbury Park with many historic homes built during the late 19th and early 20th centuries. In 2006, Allenhurst ranked 131st in Forbes magazine's list of the most expensive ZIP codes in the United States.