http://www.allentownnj.com Allentown is a Borough in Monmouth County, New Jersey, United States. As of the 2010 United States Census, the borough population was 1,828. Allentown was incorporated as a borough by an Act of the New Jersey Legislature on January 29, 1889, from portions of Upper Freehold Township, based on the results of a referendum held that day. Allentown's shopping district has antique and specialty shops, as well as restaurants. Many historic homes and historic buildings are located in the borough. The Horse Park of New Jersey is a park located in the borough that holds equestrian events. The borough received the 'Village Center' designation in 2002.