I just counted approximately 370 venues that count as "stadia" used by the various professional sports teams and division I colleges.
This would probably account for 20%-25% of the total, but that's just an educated guess.
It could be more-I am aware of many performing arts venues that accomodate in excess of 25-30,000 onlookers, and many other facilities in the range of 10-20,000;
We have a division III technical college just up the road that has two intramural student facilities of about 7-8,000, and three other venues for ice hockey, football, and basketball.
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