At The Atlantic Cities (Place Matters), Richard Florida has been sharing reports on class divides across America's largest cities and metros.  These reports examine the residential locations of today's three major classes: the shrinking middle of blue-collar workers; the rising ranks of the knowledge, professional, and creative class; and the even larger and faster-growing ranks of lower-paid, service workers, using detailed data from the American Community Survey. 

For the report on Chicago please see Class-Divided Cities: Chicago Edition. At the end of the post you can link to reports for other major U.S. cities.