NBA arenas by capacity
The 30 NBA arenas seat 18,700 on average. The biggest is United Center, 20,917, home of the Bulls; the smallest is Smoothie King Center, 16,867 (Pelicans). The oldest is Madison Square Garden (1968), then Target Center (1990) and Delta Center (1991); the newest is Intuit Dome (2024).
Capacity is the basketball seating as Wikipedia's list of current NBA arenas gives it, read on October 1, 2026; a venue two clubs share is one row.