From an MHSAA publication:
2002-2003
MHSAA District, Regional, Final tournaments - 1,600,000
Detroit Tigers - 1,400,000
Detroit Pistons - 860,000
Detroit Redwings - 820,000
Detroit Lions - 490,000

I assume multiple tourneys in Michigan which may even include soccer, swimming, field hockey, volleyball.
That's still a big number, which doesn't include the regular season attendance or sub varsity games.

That's pretty cool...I wonder if other states with multiple pro teams put out the same kind of numbers...thanks Mick!

I bet Illinois has some pretty big numbers too, and they have all four sports represented. There is a huge basketball folowing in the state.