But even in these places, the people partaking in that trend come from a relatively small demographic: They're rich, young, childless, educated and white, according to Kolko. On the whole, as he puts it, people aren't urbanizing in America — wealth is.
There are 51 metro areas in the country with at least 1 million people. In the overwhelming majority of them, the share of people living in urban neighborhoods has declined since 2000. There are just nine exceptions, metros that are urbanizing — and Washington is one of them, alongside Portland, Seattle and San Jose.