USA Today: "24/7 Wall St. reviewed admissions data across thousands of four-year, degree-granting institutions from the National Center for Education Statistics to determine each state’s most selective college. Its index was based on admission rates as well as SAT scores of admitted students to measure the difficulty of being accepted to those universities and colleges."
"The most highly selective institutions by state appear to deserve their high number of applicants, at least based on the income potential of their graduates. The median earnings for students at the schools on this list exceeds that of the vast majority of schools in nearly every case. Over a dozen have median earnings 10 years after matriculation in excess of $70,000. In the majority of colleges and universities, that figure is less than $33,000." You can find the complete list here.