If you get the Complete Book of Medical Schools, it lists information for all the accredited med schools in the US, Canada, and Puerto Rico, plus some osteopathic schools. For each school, they list % minority, avg. age of entering class, and male/female ratio. They also list other useful stuff like avg. GPA, MCAT, and lots of other good stuff. It's published by Princeton Review and is updated annually. You could also check the websites of the individual schools, but the book has it all there in one place.