According to the Web Ranking of World Universities, a total of 43 US Universities made into the Global Top 50 - Here's the list:

National Rank, Institution
1 Massachusetts Institute of Technology
2 Stanford University
3 Harvard University
4 University of California Berkeley
5 Cornell University
6 University of Michigan
7 California Institute of Technology
8 University of Minnesota
9 University of Illinois Urbana Champaign
10 University of Texas Austin
11 University of Wisconsin Madison
12 University of Washington
13 University of Pennsylvania
14 Pennsylvania State University
15 Carnegie Mellon University
16 Texas A&M University
17 Columbia University New York
18 University of California los Angeles
19 University of Maryland
20 University of Chicago
21 Purdue Univ
22 U of Florida
23 Michigan State Univ
24 U of Arizona
25 Virginia Polytechnic Institute and State Univ
26 Indiana Univ
27 New York Univ
28 U of North Carolina Chapel Hill
29 U of California San Diego
30 Johns Hopkins Univ
31 Georgia Institute of Technology
32 Duke Uni
33 Rutgers Uni
34 U of Pittsburgh
35 Princeton Uni
36 North Carolina State Uni
37 Yale Univ
38 U of Southern California
39 U of Virginia
40 U of Colorado Boulder
41 U of California Davis
42 U of California Santa Barbara
43 Iowa State Univ

Source: Webometrics 2009

Related Post: Top 20 Public and Private Universities

World University Ranking Tables

America - US News & World Report, The Princeton Review, BusinessWeek
Canada - Maclean's, Gourman Report Ranking of Canadian Universities
UK - Sunday Times, Guardian, Times Good University Guide, Daily Telegraph
World - Shanghai Jiao Tong ARWU Rankings, Webometrics, Newsweek
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