NFL: Which NFL team has the most fans? Top NFL teams with the most number of fans
How Every NFL Team's Fans Lean Politically
NFL teams' most rabid fans, in one county-by-county map - Vox
Where Do NFL Fans Live? Mapping Football Fandom Across the U.S. - Priceonomics
Ranking all 32 NFL fan bases
Countries with the Biggest NFL Fan Bases
NFL Fan Bases Who Drink The Most
The Geography of NFL Fandom - The Atlantic
NFL announces UK home marketing access for six teams; 18 teams awarded access to 26 International Home Marketing Areas, NFL News
Who is Really America's Team? The Harvard Sports Analysis Collective