You might want to take a look at what percentage of oos admits each school takes. For instance, North Carolina must, according to state law, have NC students making up at least 82% of their incoming class. That means it’s WAY harder to get into as an oos student. Generally state public schools tend to show more preference for in-state students over oos. You might find at some private schools that actually a slight preference is shown for kids from states where they don’t get a lot of applicants.