Allentown, New Jersey is located in the western tip of Monmouth County in central New Jersey about halfway between New York City and Philadelphia at the juncture of Monmouth and Mercer County Routes #539, #526, and #524. Within one and a half miles of Allentown Borough boundaries, federal roads Interstate I-195, the New Jersey Turnpike, and US Route 130 are located. Within five miles of Allentown, Interstate I-295 intersects Interstate I-195.