Allendale is a borough in Bergen County, New Jersey. Its population at the 2010 census was 6,505. The town was formed on November 8, 1894 from portions of Franklin Township, Hohokus Township and Orvil Township. The borough has a total area of 3.15 square miles, of which 3.12 square miles is land and 0.03 square miles (0.95%) is water.
The "Celery Farm," a nature preserve that is home to hundreds of animals, including fox, deer, rabbits, frogs, turtles, rodents, and most notably exotic birds, is located here. Many rare birds have also been observed here by ornithologists and bird watchers. For recreation, a number of options are available, including Crestwood Park, a man-made lake with three diving boards, three beaches, and six swim lanes. Within the Park is a recreational barn, three baseball / softball fields, two soccer / football fields, a lacrosse field, and four tennis courts.
Some movies and sitcoms have also been filmed here.