Recently, the Economic Innovation Group (EIG) released their 2016 edition of the Distressed Communities Index. MarketWatch staffer Sue Chang takes a look at the survey, which reveals that the number of Americans in distressed communities jumped from 30 million in 2015 to 50.4 million in 2016.

The index is calculated on how each area code fares based on metrics such as education and poverty rate. Ranks are then converted into scores with anything above 80 being distressed and below 20 being prosperous. Here is one of the EIG's key findings for this index:

Among large cities, Cleveland topped the most distressed list, followed by Detroit, while Gilbert, Arizona — which had the highest median income in the country in 2015 — was the most prosperous city in the U.S.

Read more >