Answer would be no.
DMV won't divulge information and, even if they would, it would be of sketchy quality at best.
Besides the new sales as quoted by Meredith, there are untold numbers of cars that were imported to the US some years after the original (mostly European) sale. Just an example: American servicemen who purchased a Pagoda when stationed in Germany, then upon moving back home, taking this car with them. There are many euro spec cars in the US, Rodd Masteller's with the round Italian fender turn signals is an example of this.
And, yes, over the past 15 or more years, many Pagodas found their way back over here. For example, in Sweden there are now more Pagodas registered than were ever sold new there originally! Many came over from the US.
So it's anyone's guess really. Mine is that roughly half of cars survive today - that would make it 25,000. But some who might know better than me put this figure higher, around 30-35,000.
As to your specific question, I would guess that, although half of the cars were originally sold to the US, some 20-30% of those (and of later imports) were later exported back out, to Europe but also to other continents. In my estimates then, this would put the remaining number in the US at around 9-10,000. Then again, with all of the estimating involved, I would not be surprised if it were substatially lower or higher.
Cees ("Case") Klumper in Amsterdam
'69 white 280 SL automatic