#6 Los Angeles Dodgers

The Dodgers have been one of the most storied franchises in MLB history, which certainly helps them on this list. There have been fans that watched the team back in Brooklyn. Their broadcaster, Vin Scully, has been with the Dodgers since they were in Brooklyn, and started in 1950.
They are constantly at the top of the MLB attendance list, and have plenty of fans that come on any given night. Although some come for the celebrities or leave in the seventh, they still fill the stadium night after night.
Current success of the team has helped the Dodgers. The ugly divorce that ended Frank McCourt’s days in LA certainly helped. In 2015, they had a game that brought in 53,518 fans, the most in the bigs. Between 2010 and now, the Dodgers rank second to only the Yankees in total attendance.
Not to mention, the Dodgers are finally good again. They have good players and a good team to root for. They brought in a fan-favorite guy in Dave Roberts, his old club’s fans seemed to always love the guy. And since 2010, they’ve had 22 All-Star players.
The Dodgers are a successful franchise, especially in revenue, so I would expect them to have good fans for years to come.
Next: Makes sense given their success