The Raleigh/Cary area has the largest percentage of PhD’s in the world!
Actually, it’s the Research Triangle that has the highest concentration of PhDs:
“The Research Triangle
Chapel Hill ~ Raleigh ~ Durham
Put three world-class universities together and you’ve got all the elements of great research and ground-breaking technology. Back in 1959, the Research Triangle Park was established as a joint effort by Duke University, the University of North Carolina, and North Carolina State University. They wanted to attract research, and with so many superlative minds in close proximity, success was a sure thing.
Today, the Park employs almost 50,000 people and has been honored with three Nobel Prize winners. There also are more colleges and universities around here, creating even more of a draw for the finest minds of our time. (This area has the highest concentration of PhDs in the nation.)
http://www.carolinaliving.com/heartlands/rtpraleigh.asp