| Bristol Municipal Employees Federal Credit Union | Connecticut |
| Bristol VA School System Federal Credit Union | Virginia |
| British Airways Employees Federal Credit Union | New York |
| Broadway Federal Bank | California |
| Broadway National Bank | Texas |
| Brockport Federal Credit Union | New York |
| Brokaw Credit Union | Wisconsin |
| Bronco Federal Credit Union | Virginia |
| Brookland Federal Credit Union | South Carolina |
| Brookline Bank | Massachusetts |
| Brookline Municipal Credit Union | Massachusetts |
| Brooklyn Cooperative Federal Credit Union | New York |
| Brooks Community Federal Credit Union | Minnesota |
| Brosnan Yard Federal Credit Union | Georgia |
| Brotherhood Credit Union | Massachusetts |
| Broward Healthcare Federal Credit Union | Florida |
| Brown County Employees Credit Union | Wisconsin |
| Brown County State Bank | Illinois |
| Brownfield Federal Credit Union | Texas |
| Brown-Forman Employees Credit Union | Kentucky |
| Brownsville City Employees Federal Credit Union | Texas |
| Bruning State Bank | Nebraska |
| Brunswick Bank & Trust | New Jersey |
| Brunswick County Teachers Federal Credit Union | Virginia |
| Brunswick State Bank | Nebraska |
| Brush Country Bank | Texas |
| Bryant Bank | Alabama |
| Bryant State Bank | South Dakota |
| B.S. And C.P. Hospitals Employees Federal Credit Union | New York |
| BTC Bank | Missouri |
| BTH Bank | Texas |
| Buckeye Community Bank | Ohio |
| Buckeye Community Federal Credit Union | Florida |
| Buckeye State Bank | Ohio |
| Buckley State Bank | Illinois |
| Bucks County Bank | Pennsylvania |
| Bucks County Employees Credit Union | Pennsylvania |
| Buena Vista National Bank | Illinois |
| Buffalo Community Federal Credit Union | New York |
| Buffalo Conrail Federal Credit Union | New York |
| Buffalo Cooperative Federal Credit Union | New York |
| Buffalo Federal Bank | Wyoming |
| Buffalo Metropolitan Federal Credit Union | New York |
| Buffalo Police Federal Credit Union | New York |
| Buffalo Service Credit Union | New York |
| Builders Bank | Illinois |
| Building Trades Federal Credit Union | Minnesota |
| Bulab Employees Federal Credit Union | Tennessee |
| Bulldog Federal Credit Union | Maryland |
| Bull's Eye Credit Union | Wisconsin |
| Burbank City Federal Credit Union | California |
| Burke & Herbert Bank & Trust Company | Virginia |
| Burling Bank | Illinois |
| Burlington Municipal Employees Credit Union | Iowa |
| Burlington Municipal Employees Federal Credit Union | Massachusetts |
| Burlington Northern Santa Fe Railway Credit Union | Illinois |
| Burlington Northtown Community Credit Union | Missouri |
| Burns & McDonnell Credit Union | Missouri |
| Burton State Bank | Texas |
| Busey Bank | Illinois |
| Business and Industrial Federal Credit Union | Indiana |
| Business Bank of Texas | Texas |
| Business First Bank | Louisiana |
| Butler ARMCO Employees Credit Union | Pennsylvania |
| Butler ARMCO Employees Credit Union | Pennsylvania |
| Butler County Teachers Federal Credit Union | Pennsylvania |
| Butler Heritage Federal Credit Union | Ohio |
| Butte Community Federal Credit Union | Montana |
| Butte State Bank | Nebraska |
| BVA Federal Credit Union | Pennsylvania |
| B & V Credit Union | Kansas |
| BVMSN Federal Credit Union | Pennsylvania |
| B&W Mississippi Employees Federal Credit Union | Mississippi |
| Bykota Federal Credit Union | New York |
| Byline Bank | Illinois |
| Byron Bank | Illinois |
| Byron State Bank | Nebraska |