I was sitting around wondering - is there some way to get a reasonable estimate of the number of java-based companies in, say, the US? And then rolling with that, what about c#? (and so on)

let's argue that a company can be both java and c# based - in fact, let's modify it to read "companies that could reasonably hire an xyz developer"

Finally, would it be possible to organise this answer in terms of rough size of the companies? "startups" vs established?