The Wall Street Journal has an article and interactive map on the geography of personality types. Catholicgauze's upbringing matches that of his home region in being dutiful, self-disciplined, and extroverted.
The spatial patterning is clear. History and present play a big role on the map. Stereotypes of the business-world dominated northeast and the pioneer-past, hardy Midwesterners still ring true. As mentioned above, it is important to remember that people will move to be in liked minded regions thus reinforcing the cultural personality through cultural selection (Hat tip: Geography at About).