Here's the information you're looking for. Rather than go by sheer numbers, I've compiled percentages; they're more representative, given than not all law schools have the same size student body (i.e., if two schools both had 25 international students in their student body, but one had an overall student body size of 100 and the other had an overall student body size of 500, then the first would obviously have the greater international student body, even though they both had the same original amounts).
The information was obtained from LSAC's Official Guide to ABA-Approved Law Schools (available for free here:
https://officialguide.lsac.org/release/OfficialGuide_Default.aspx)--in fact, if you want to check out how other schools stack up (for example, those West Coast schools you're curious about), you can go there and view each school's individual profile; it'll have the figures there.
Two final notes: (1) LSAC's does not specifically list "international students." It lists "non-resident alien" numbers, so that is what I used. It is provides
enrollment numbers, not
admissions numbers, which is important to remember. (2) The figures are based on the most recent incoming class and student body information available to LSAC, so everything is based off 2011 numbers.
In my figures, I'm presenting you with two lists: One sorted by the percentage of the 1L class, and the other sorted by the percentage of the overall student body.
As you can see by the figures, Yale, Northwestern, and UPenn seem to the frontrunners in this particular category.
Hope this helps!