There’s a site, commoncensus.org that tracks how people identify themselves geographically and where they live.  For example you can look at a map and see how many people in North Carolina most identify themselves as Southern Americans or simply as Americans.

Even more interesting to me is the breakdown of sports team affiliations by geography that you can find at the CommonCensus Sports Map Project.  Right now I can tell you that within a 50 mile radius of me there are 27 Carolina Panthers fans and 8 Washington Redskins fans (there are also 2 Cowboys fans who should be deported) who have contributed to the project.  The project depends on people filling out the questionnaire on their website to build their data so I encourage all of you (except Cowboys fans) to go and participate.  The same is true for the regular census page as well.