MLB Fan Bases: Ranking MLB Fan Bases by Attendance

9. Boston Red Sox (Total Attendance 2,895,575; Average Attendance 35,747)

It is a little surprising that the Red Sox are not higher on this list considering the support that Boston teams generally get from their fan base. Still, Fenway Park’s capacity is just under 38,000 and their average attendance is just a few thousand short of that.

The Red Sox were overwhelming throughout the entire 2018 season, winning more games than any team and cruising to another World Series victory.