Forbes picked the Top 20, based on how many fans go to games, watch their teams on TV, and follow them on social media.
But they only did the Big Four sports: baseball, basketball, football, and hockey. Here's the Top 10:
3. The San Francisco Bay Area
10. Los Angeles
I find Boston and Philly fans to be obnoxious and absurd quite often. Surprised LA is on this list and NYC isn't. LA is famous for fans showing up in the 3rd inning of Dodger games and not showing up at all for the Chargers. New Yorkers are pretty passionate whether it be for the Yankees or in displaying their disappointment in the Knicks.