In nine out of every ten cities, the share of adults living in middle-income households has fallen. The result has caused a stark divide between rich and poor neighborhoods in cities across America.

A new project called "Wealth Divides" from mapping-software company Esri shows how the neighborhoods are divided primarily between wealthy and working class, with dwindling signs or middle-income households or neighborhoods.

For example, CityLab examined the divide in New York:

Stark disparities can be found in neighborhoods that are within minutes of each other: The median household income for a tract near Central Park exceeds $200,000, while an East Harlem neighborhood just a few blocks away is under $16,000. That divide in close neighborhoods, however, may be a good thing for lower-income residents, as economist Joe Cortright argued. He cited a study by New York University’s Furman Center that found that residents living in public housing within a wealthier neighborhood tend to show “dramatically better economic and quality-of-life outcomes” than those in poor neighborhoods, which furthers the support for mixed-income neighborhoods.

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