Being from Rochester I can confirm 100% that Rochester is at least 95% Bills fans. They start to fade the closer you get to Syracuse. Northern PA, like Bradford has maybe a 50/50 split between Bills and Steelers fans. Plenty of Southern Ontario Bills fans, just not sure I'd label it Bills country. Just like Detroit prolly has plenty of fans from Windsor, Ontario. But they wouldn't consider it Lions country. I'd consider true Bills country to be the NY/PA border to the west, Rochester/Geneva to the east and the NY/PA border to the south. IMO