15. Duke University
Current endowment: $6.8 billion
Change from 2015: -6.3 percent
Cost of attendance 2016: $65,703
Average mid-career income of alumni: $119,000
*Sources: National Association of College and University Business Offices, Chronicle of Higher Education, PayScale. Endowment data is for the 2016 fiscal year (July 1, 2015 to June 30, 2016).