Princeton Review has each college and university rated from 60-99 on selectivity. I've looked in vain to find on their website a listing of schools by rating, thinking it would be a useful tool in deciding whether to consider a given school to be a reach, a target, or a safety. Since the PR website doesn't have such a list, I made my own groupings using USNWR's top 50 universities and top 50 LACs. I certainly wouldn't treat it as gospel, but in the event that you all find it useful, or at least interesting, here's the list:
99 - Harvard
Wash U. St. L.