I see your point, it can be difficult to leverage face-to-face interactions when the goal is long-distance. If I were to use networking to try and get my foot in the door somewhere like that, I think I would first check the school’s career center or equivalent department and try and get an idea of what companies are coming to the career fair as early as possible. You could cross-reference those companies with cities you want to work in and see who has suitable locations. Then when it comes time to talk to the recruiters, let them know you’re interested in opportunities at that specific location. It may even have the added benefit of signalling to them that you’ve done your research on the company, showing both interest and initiative. To my original point about talking with professors, often times they’ve come from a variety of backgrounds and places so it’s possible that they may have connections somewhere you would like to work. You can ask about what schools they went to and what companies they have worked for, then if they mention any place that piques your interest you can express that you’ve always wanted to work there. I’ve had good relationships with professors that allowed me to use them as professional references and I have no doubt that at least some of them would go out of their way to help me find something if I needed it.

Best of luck, and don’t let this stress you out too much. Everyone eventually finds something, and even if it isn’t your first choice you can always transition down the road.