How can i find out how many students from a specific country are studying in Princeton, Yale, Dartmouth, Brown , U of T Austin, etc. ? And how can I contact them? something like http://www.hio.harvard.edu/statistics
I don’t think you can. How do you “contact” any random person that you don’t know? That’s a bit creepy.
Something like admissions.vanderbilt.edu/contact/students for other universities
You email admissions and ask them something like
"are there any students from < country > at your university? Are any involved in the academic field I’m most interested in? Would it be possible to exchange emails with some of them so that I have an insider’s perspective about the experience, and in particular about cultural issues? "