Wow... highly doubtful, but impressive if true.
I'm not sure where to find the percentage break down, but Case's 2008 numbers were:
Enrollment (fall 2008):
Graduate and Professional: 5,458
Total (headcount, all programs): 9,814
States represented: 50
Countries represented: 87
EDIT: uh oh, i went off topic again. ... I LOVE West Side Market and Great Lakes Brewing Company!!
Last I heard about 50% of the undergrad population is from Ohio. The graduate population is obviously MUCH more diverse.
For the past two years our incoming class of 1000 students has been over 60% out of state and 8.5% international students, and those numbers will not be going down. As doc broc mentions, the graduate/professional students are even higher percentages.
Regarding those students staying - of those that go immediately into the workforce (about 50%), slightly more than 50% of those students take jobs in northeast Ohio.
And that's another reason why I love Cleveland!