How many 10000 bills are in circulation?

Answer 1

At this time, effectively none.

Only small numbers of $5000 and $10,000 bills had been printed before large-denomination bills were discontinued in 1945. Almost none were in general circulation; at that time $10,000 could be a year's income for a very wealthy person so they tended to be used by people who were extremely rich ... and often shady. For example, the gambling mogul and criminal Benny Binion amassed a collection $10,000 bills at his Las Vegas casino.

After distribution of high-value bills was halted in 1969, most of the $5000 and $10,000 bills that were in private hands stayed there and/or eventually ended up in museums.