I know some schools have caps and other don’t. Thanks in advance.
For new frosh, some examples:
Delaware 70% https://www.udel.edu/admissions/for/freshmen.html
Alabama 60% http://www.al.com/news/tuscaloosa/index.ssf/2014/07/is_the_university_of_alabama_s.html
Ole Miss 57% (see above)
Michigan 43% http://www.annarbor.com/news/university-of-michigan-sees-increase-in-out-of-state-students/
Vermont 76% (OOS 74 & international 2) (might be the highest)
You can find this stat for any school at College Navigator. Enter name of school, then on school’s page, look under Enrollment for the Undergrad Student residence graph.