Still pretty different. Compare Tulsa city to neighboring counties: https://www.census.gov/quickfacts/fact/table/osagecountyokla...

Naperville is a suburb of Chicago, and without looking I can confidently tell you that it's more white than Chicago, but less white than a nearby rural area. I will look though: https://www.census.gov/quickfacts/fact/table/chicagocityilli...

Great insight -- thanks!

Anecdotally it really seems like this should be true.

Cities in mostly ethnically homogeneous states tend to still have things of value that might draw people of diverse ethnic backgrounds. I'm in Nashville Tennessee and there are far more people of Asian or middle Eastern descent here in the city than there are in the surrounding rural areas, due to the universities and the job opportunities which draw people from out of state.

That's the median city in the set of cities with population greater than 100k, not median of all cities.