Allenhurst is a borough in Monmouth County, New Jersey, United States. As of the 2010 United States Census, the borough's population was 496, reflecting a decline of 222 (-30.9%) from the 718 counted in the 2000 Census, which had in turn declined by 41 (-5.4%) from the 759 counted in the 1990 Census.
Allenhurst was incorporated as a borough by an Act of the New Jersey Legislature on April 26, 1897, from portions of Ocean Township. Bordered by the Atlantic Ocean to the east and Deal Lake to the west, the borough is within close proximity to New York City and is a stop on the New Jersey Transit North Jersey Coast Line. The borough is situated in the center of a string of wealthy communities between Long Branch and Asbury Park.
There are many historic homes in Allenhurst built during the late 19th and early 20th centuries in Victorian, Queen Anne, Italian Renaissance Revival, Tudor Revival, Prairie, Mission Revival, American Craftsman, Shingle, Colonial Revival, Neoclassical and Gothic Revival architectural styles. Local ordinances overseen by an historic preservation commission have ensured the preservation of historical architecture by enforcing strict guidelines for the renovation of older homes.
In 2006, Allenhurst ranked 131st in Forbes magazine's list of the most expensive ZIP codes in the United States. In the magazine's 2012 rankings, the borough was ranked 448th, with a median price of $665,043.