NFL's Most Popular Teams – Outside the Beltway
Here's an NFL fan map — based on Facebook likes – Twin Cities
Ranking the 10 Professional Football Leagues to Compete with the NFL
Who are the most popular NFL teams? Cowboys lead US in search hits
Google Trends: Who Is America's Most Popular NFL Team?, News, Scores, Highlights, Stats, and Rumors
Ranking the most popular NFL teams by state
MAP: the Most Popular NFL Team in Every State