Only 25% of US adults have a bachelors degree. Of the 25% of those with bachelors degrees, the large majority come from regional public schools, think "Cal Stat

Only 25% of US adults have a bachelors degree. Of the 25% of those with bachelors degrees, the large majority come from regional public schools, think "Cal State Sacramento", or "Northern Illinois University". Graduates of these types of schools often grew up within 2 - 3 hours of their university, and after school the majority end up in the largest city within a 2 - 3 hour drive of their university. If you didn't get a degree, you're much more likely to live close to where you grew up. If you went to a top school (top 25 - 50 in USNWR), then your social circle was much more "mobile" than average.