Warren County's proximity to Easton, PA and also the Philadelphia Eagles' training camp in Bethlehem on the campus of Lehigh University makes it weird as far as it being a Northern New Jersey County. Some people call it a hoagie, and you'll also find Pork Roll on the menu (and not Taylor Ham) at most diners. . . . . not to mention a good amount of Eagles' fans.
Well, read this article on the change in demographics over the years in this area known as the Lehigh Valley (it also includes the PA side).