Llewellyn Park is a historic gated community and census-designated place (CDP)[4] located within West Orange in Essex County, in the U.S. state of New Jersey.

[6] The landscaping is in the 19th century romantic style of New York's Central Park, and includes winding paths, ornamental trees, shrubs, and flowers.

Haskell discovered the lush, wooded area on the eastern slope on the first range of the Watchung Mountains which was originally farmland owned by Ira Harrison Condit.

A number of Llewellyn Park's homes were designed by prominent American architects including Alexander Jackson Davis, Calvert Vaux, Charles McKim, Stanford White, and Robert A.M. Stern.

Llewellyn Park residents enjoy the combination of close proximity to New York City, a relaxed semi-rural lifestyle, and exceptional privacy.

A major function of the Ladies Association is its commitment to fostering a sense of community among Park residents by planning social activities for adults and children.