U.S. News and World Report collected data from nearly 1,800 colleges to compile its annual rankings of best colleges in the U.S. The top Best National Universities list for 2015 were:

• Princeton University
• Harvard University
• Yale University
• Columbia University
(tied with)
• Stanford University (tied with)
• University of Chicago
• Massachusetts Institute of Technology
• Duke University (tied with)
• University of Pennsylvania
• California Institute of Technology

See the full list here.
Source: U.S News and World Report