Twitter map shows the most popular NFL teams in each county of the United States
Super Bowl 2013: Facebook Map Shows Iowa's NFL Fan Allegiances
Facebook showcases NFL fandom across the U.S.
Die-Hard or Fair-Weather Fans? Ranking All 32 NFL Fan Bases
Human Geography: NFL Fan Regions - The Human Geo Guy
Where Do NFL Fans Live? Mapping Football Fandom Across the U.S. - Priceonomics
Twitter map shows the most popular NFL teams in each county of the United States
Amazing Maps of the Sports World
Ticket sales data show 49ers fan cluster above Arctic Circle
Woof! Twitter says Athens County is Browns territory, News
Map of NFL Fandom Across the U.S. [OC] : r/dataisbeautiful
NFL Teams by County : r/MapPorn
The Geography of NFL Fandom - The Atlantic