Here is a list of the 2015 top 20 US national universities, just released today by US News:

Princeton University

Harvard University

Yale University

Columbia University

Stanford University

University of Chicago

Massachusetts Institute of Technology

Duke University

University of Pennsylvania

California Institute of Technology

Dartmouth College

Johns Hopkins University

Northwestern University

Washington University in St. Louis

Cornell University

Brown University

University of Notre Dame

Vanderbilt University

Rice University

University of California—Berkeley