What Do You Know About Psychology Organizations? 31 The original total membership list of the American Psychological Association (APA) at its founding in 1892. 152,000 The number of APA members today. 25,245 The number of members of the National Association of School Psychologists, according to NASP’s 2009 membership statistics. 13 The number of specializations offered by the American Board of Professional Psychologists. 2,823 The number of applicants who successfully matched through the Association of Psychology Postdoctoral and Internship Centers (APPIC) in 2010. 846 applicants were not matched to an internship position. 1,090 The number of chapters of Psi Chi, the International Honor Society in Psychology for undergraduate and graduate students. Psi Chi chapters are found in the USA, Canada, and Ireland. There are more than 500,000 lifetime members.