A propos this, here is an old study of placement in SCOTUS clerkships for 15 terms. Because of the small number of clerks chosen in a given year; because clerks are only chosen from the very top of any law school’s class; because current clerks participate in the process of selecting new clerks; and because the Justices themselves have particular school loyalties,[1] gross numbers are probably more informative, and so the ranking below is based on the total number of clerks placed on the Supreme Court.  For informational purposes, the approximate size, rounded to the nearest 50, of recent graduating classes is listed in the final column.

This includes all clerks on the Supreme Court from the 1991 term through the current 2005 term.  The late Chief Justice Rehnquist’s clerks were accepted by the new Chief Justice John Roberts, and so are counted; the clerks C.J. Roberts brought with him from the D.C. Circuit were not counted, since they were selected in a less competitive process.

Rank	School	Total number of clerks	Typical Class Size
1	Harvard University	128	550
2	Yale University	100	200
3	University of Chicago	65	200
4	Stanford University	42	150
5	Columbia University	32	400
6	University of Michigan, Ann Arbor	21	350
7	University of Virginia	19	350
8	New York University	16	400
9	University of California, Berkeley	12	250
10	University of Texas, Austin	11	450
11	Northwestern University	9	200
12	Duke University	7	200
12	Georgetown University	7	600
14	University of Notre Dame	6	150
15	George Washington University	5	400
15	University of Pennsylvania	5	250
17	University of California, Los Angeles	4	250
18	Brigham Young University	3	150
18	University of Kansas	3	150
18	Vanderbilt University	3	200
21	University of Illinois, Urbana-Champaign	2	250
21	University of North Carolina, Chapel Hill	2	250

The following schools each graduated one student who secured a U.S. Supreme Court clerkship between 1991 and 2005:  Boston College; Cornell University; Ohio State University; Oxford University; Pepperdine University; Rutgers University, Newark; State University of New York, Buffalo; University of Arizona; University of Georgia; University of Minnesota, Twin Cities; University of Missouri, Columbia; and University of Southern California.

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[1] Justice Stevens, for example, taught at Northwestern, and often hires Northwestern clerks; the same is true for Justice Breyer and Harvard; Justice Ginsburg and Columbia; and Justice Scalia and Chicago.  Justice Scalia is also partial to Notre Dame.