The first question is - why would you want to do that?
The only way of identifying where someone is from is from the location information they put in their profile. This is just a plain text entry field, and so anything can be put in there. There's no efficient way of searching the field and you wouldn't know whether someone has put "Sydney" or "Glebe" or "Bondi" or anything else like that.
So in general - the answer is "no" it is not possible.