4. Dallas Mavericks (Average Attendance: 19,735)
The Dallas Mavericks have one of the best fan bases in the NBA, as they have been selling out games for years.
The great fans of the Mavericks finally have a new franchise player to root for, in this year’s first round pick Luka Doncic. Doncic is leading the Mavericks to a lot of success and is a favorite to win the Rookie of the Year Award.