PDK International, previously known as Phi Delta Kappa International, is an international professional organization for educators. It formed from the merger of Pi Kappa Mu, Phi Delta Kappa, and Nu Rho Beta in Chicago, Illinois, on March 1, 1910, The resulting Phi Delta Kappa chapters retained the charter dates from the predecessor fraternities. Following is a list of PDK International chapters, with active chapters indicated in bold and inactive chapters in italics.The Phi Delta Kappan Vol. 6, No. 5, Apr. - Jun., 1924 p37-
Undergraduate/Collegiate chapters