Newark, N.J., leads the pack of U.S. cities with the highest share of residents who don’t use banks, a new report shows.

Click to view an interactive map of unbanked rates by America’s largest cities. WSJ

There have long been concerns—both in the government and in the banking industry—about the number of households that lack access to the U.S. banking system, with many efforts to attract low-income adults falling short.

New data released this week by the Corporation for Enterprise Development, a nonprofit advocacy group for low-income consumers, shed light on where these households are concentrated, confirming that the highest share of consumers that lack bank accounts are in major cities with large minority populations.