Let's see, the AFC North in it's entirety would probably be the wildlings. You have murderers (Ray Lewis and the Ravens), rapists (Rapistberger and the Steelers), thieves (the Bengals sure as hell did rob Oakland of draft picks and gave next to nothing in return). And because everyone wants to watch Tyrion, no one gives a damn about that particular storyline....so the team no one cares about (the Browns).
I disagree that the Giants are the Starks. If anything, the Mannings are Tangaryns. The come from a long, southern pedigree that probably consists of inbreeding. You have Peyton (Viserys), the heir apparent who believes he is entitled to everything. Then little brother Eli as Dany, who has risen from his brother's shadow and surpassed him through real leadership. That would make the Giants representativ of Qarth. After all, New York is the greatest city in the world, like Qarth and much like Qarth you have many factions vying to control it (the Giants and the Jets).
I think you are right, the Packers are the Starks. Guardians of the North, the fall of their old leader (Favre) resulted in the young wolf whom everyone underestimated (Rodgers) becoming an unstoppable warrior.