[ChiSoxRox]

For Iowa City, there are three census tracts over 10,000 ppsm. One is all dorms north of the Old Capitol, but two more are full of larger houses and apartment rows stuffed with students.

Also, turns out the first go around I neglected to check Cincinnati's suburbs across the river in Kentucky. I've added that 10,711 figure to Cincy, although not to the Midwestern total.

For comparison, Seattle has a population of 239,944 in these census tracts (198,676 in the city, 12,854 in Tacoma, 28,414 in the suburbs).