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There may be some geographic bias there because California’s Asian population is much higher than the US as a whole.

I would be interested to see if there is any bias toward state of residence for a school as widely known and respected as CalTech.

Of course there is. Harvard has a disproportionate number of students from New England, and more specifically Massachusetts, as well. Plenty of smart kids don't want to be too far from home or travel a long way to an unfamiliar environment.

As for CalTech's rep, I'm just one person on the East Coast and wasn't a Tech-type student but I forget it exists all the time. If someone asked me to name a West Coast school to compare to MIT, "Stanford" would be all I could think of.

See CalTech for an example of an elite school that has race-blind admissions

This is not true. See http://finance.caltech.edu/Resources/cds (pick any year), Section C7.

Do you know how much is black? If it's less than 8% (or whetever the US average is), then it's literally "damned if you do, damned if you don't".