In North Jersey - they will be rooting for the New York Giants. And in South Jersey, they'll be pulling for the Philadelphia Eagles. However, there will be about 3 - 4 New Jersey counties in the "central areas" where you can see a 50/50 mix of Eagles & Giants' fans at the nearby tavern for next Sunday's NFL playoff game. However, each county distributes their sports loyalties differently.
Warren County is pretty much Giants' territory now - except for some mixture in the southwestern river towns centering around Phillipsburg - but these days - it's all leaning Giants.
Hunterdon County is Mostly Giants - except there is a mixture along the river towns. In the southern part, there continues to be some Eagles' dominance.
Mercer County is pretty evenly split and it is the only county in NJ with no clear territory in any town. The northern towns lean toward the Giants & the southern towns lean toward the Eagles.
Ocean County has many of its municipalities leaning toward the Giants, though there is strong Eagles in the far south and in Plumsted Twp. However, it is the only county that has all 4 types of loyalties (Solid Giants, Leaning Giants, Solid Eagles & Leaning Eagles).
Monmouth County has the two townships in the panhandle that are a mixture, but there aren't many good taverns in those areas to compare here.