OneUnited Bank | 8,260 followers on LinkedIn. The nation's Largest Black-owned bank, with the nation's Largest surcharge-free ATM network! | Welcome to OneUnited Bank, a trailblazing African-American-owned trust company headquartered in Boston, Massachusetts. As a Community Development Financial Institution (CDFI) designated by the Treasury Department, we have continuously demonstrated our dedication to uplifting underserved urban communities in Boston, Miami, Los Angeles, and beyond. Our direct-to-consumer approach allows individuals and families to become active participants in the movement towards financial empowerment.