Maybe a bank does not own it, maybe it does. Checking county records will be the most likely way to check. If it is bank owned they will get around to putting it on the market for sale in time as they do research on its value. You trying to find out what bank owns it and who to speak to at that bank will likely be a futile mess. Banks are huge mazes of bureaucracy that can go from state to state so finding anyone to speak to that knows what is going on will not be fun nor easy. Your best bet is to watch for activity at the house as the soon to be listing agent visits, takes pictures, changes the lock and does any work on the house prior to listing it.