Since the crisis, the number of people living in prosperous zip codes expanded by 10.2 million, to a total of 86.5 million, an increase that was much greater than any other social class. Meanwhile, the number of Americans living in distressed zip codes decreased to 3.4 million, to a total of 50 million, the smallest shift of any other social class. This indicates that the geography of economic pain is in rural America.

"While the overall population in distressed zip codes declined, the number of rural Americans in that category increased by nearly 1 million between the two periods. Rural zip codes exhibited the most volatility and were by far the most likely to be downwardly mobile on the index, with 30 percent dropping into a lower quintile of prosperity—nearly twice the proportion of urban zip codes that fell into a lower quintile.