Not sure, but the Census Bureau might be a good start.
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Fraternally, DeltAlum
DTD
The above is the opinion of the poster which may or may not be based in known facts and does not necessarily reflect the views of Delta Tau Delta or Greek Chat -- but it might.
I've used this site: http://nces.ed.gov/
for an article I'm writing on the lack of girls in computer science. I know it has breakdown of race...not sure to what extent...but it's worth checking out.