Lee Sigelman refers to himself as a “midwesterner” even though he lives in D.C. This reminds me that we want to redo our geography-and-voting analyses looking at the states where people come from (rather than where people currently live). A bunch of surveys ask this, I think.
More generally, I assume that some sociologists have looked at the question of how people define themselves by region. I know there’s been lots of research on people’s racial, ethnic, and national self-definition. I remember that, about 15 years ago, Michael Hout gave a talk in our seminar: “How 4 million Irish immigrants became 40 million Irish Americans.” Contrary to expectations, it wasn’t about prolific breeding, it was about how people of mixed background choose to classify themselves. (Maybe things are different now, in the era of Caublanasians.)