New Jersey (USA) is 408 times larger than Allentown, Pennsylvania.
New Jersey is a state in the Northeastern and Middle Atlantic regions of the United States. It is bordered on the north and east by New York State, on the southeast and south by the Atlantic Ocean, on the west by Pennsylvania, and on the southwest by Delaware. Wikipedia
Area: 47 km2 calculated
Allentown is a city located in Lehigh County, Pennsylvania, United States. It is Pennsylvania's third most populous city, after Philadelphia and Pittsburgh, and the 224th largest city in the United States. Wikipedia