That would be a great answer. I'm going to say, you can't. I suppose if you could hack into each states vehicle registration log, you could search for VIN family's (Challenger JS23, or JH23, or JH27..etc), but I am not aware of any state that has this, or allows it if they have it. Over the years I've personally parted out a dozen cars, that now wouldn't exist. I know of many people who have done the same. Hemi Cars, 6-Pack cars, and Convertibles are all worth more, so they are being saved and resurrected. 6 cylinder, 318 and 383 cars are the donor cars for many of the more valuable. 72-74 cars also aren't worth as much, so they aren't being saved. My guess would be 15-20% of Challengers built are still around in some place, or condition. I'm sure others would say a little more, or less.
16
16,437
Not possible to answer presently as 2012 Challengers are still being produced
31000
Around 16,000
As many as Chrysler LLC can sell
Type your answer here... 1500
2000
29,460 were built in 1971
none, they were chargers
6,400 cars were built for pre-sold.
There were about 32,000 Dodge Challengers sold in 1973. As far as to how many are still in existence today, there's no way to measure such a question with any real degree of accuracy (in other words... your guess is as good as ours).