EconomicInclusion.gov is a treasure-trove of US-based unbanked and underbanked data by state and region.
They also recently posted the 2011 FDIC National Survey of Unbanked and Underbanked households.
(Thanks, Nate and JJ)
"It’s not a pipeline problem. It’s about loneliness, competition and deeply rooted barriers." Read more in the NYT .