| St. Johns Bank | Missouri |
| St. Johns Buffalo Federal Credit Union | New York |
| St. John Self-Help Federal Credit Union | Louisiana |
| St. John United Federal Credit Union | New York |
| St. Joseph Medical Center MD Federal Credit Union | Maryland |
| St. Josephs Broadmoor Federal Credit Union | Louisiana |
| St. Josephs Canton Parish Federal Credit Union | Ohio |
| St. Joseph`s Credit Union | Texas |
| St. Josephs Hospital Federal Credit Union | Florida |
| St. Josephs Parish Buffalo Federal Credit Union | New York |
| St. Joseph Teachers' Credit Union | Missouri |
| St. Jude Credit Union | Illinois |
| St. Jules Credit Union | Louisiana |
| St. Landry Bank and Trust Company | Louisiana |
| St Landry Homestead Federal Savings Bank | Louisiana |
| St. Landry Parish Federal Credit Union | Louisiana |
| St. Louis Bank | Missouri |
| St. Louis Community Credit Union | Missouri |
| St. Louis Firefighters & Community Credit Union | Missouri |
| St. Louis Newspaper Carriers Credit Union | Missouri |
| St. Louis Policemen`s Credit Union | Missouri |
| St. Ludmila's Credit Union | Iowa |
| St. Luke's Community Federal Credit Union | Texas |
| St Lukes Credit Union | Missouri |
| St. Mark Credit Union | Illinois |
| St. Marks Federal Credit Union | New York |
| St. Martin Bank & Trust Co. | Louisiana |
| St. Martin de Porres Parish Federal Credit Union | Illinois |
| St. Martin National Bank | Minnesota |
| St. Martin's Federal Credit Union | New York |
| St. Mary Credit Union | Colorado |
| St. Mary Parish School Employees Federal Credit Union | Louisiana |
| St. Mary's & Affiliates Credit Union | Wisconsin |
| St. Marys Assumption Parish Federal Credit Union | Ohio |
| St. Mary's Bank | New Hampshire |
| St. Mary's Credit Union | Massachusetts |
| St. Marys Parish Ottoville Federal Credit Union | Ohio |
| St. Matthews Federal Credit Union | Virginia |
| St. Michaels Fall River Federal Credit Union | Massachusetts |
| St. Michaels Federal Credit Union | Colorado |
| St. Monica Federal Credit Union | Indiana |
| Stock Growers Bank | North Dakota |
| Stockman Bank of Montana | Montana |
| Stockmans Bank | Oklahoma |
| Stockmens Bank | Montana |
| Stockmens Bank | Colorado |
| Stockmens National Bank in Cotulla | Texas |
| Stockton Community Federal Credit Union | California |
| Stockton National Bank | Kansas |
| Stock Yards Bank & Trust Company | Kentucky |
| STOFFE Federal Credit Union | Ohio |
| Stone Bank | Arkansas |
| Stonebridge Bank | Pennsylvania |
| Stonebridge Bank | Minnesota |
| Stonegate Bank | Florida |
| StonehamBank | Massachusetts |
| Stoneham Municipal Employees Federal Credit Union | Massachusetts |
| Stoppenbach Credit Union | Wisconsin |
| Stoughton Co-operative Bank | Massachusetts |
| Stoughton Town Employees Federal Credit Union | Massachusetts |
| Stoughton U.S. Rubber Employees Credit Union | Wisconsin |
| St. Paschal Baylons Federal Credit Union | Ohio |
| St Patrick Credit Union | Michigan |
| St. Patrick's Parish Credit Union | Vermont |
| St. Pats Employees Federal Credit Union | Montana |
| St. Paul Federal Credit Union | Minnesota |
| St. Pauls Euclid Parish Federal Credit Union | Ohio |
| St. Pauls Federal Credit Union | Pennsylvania |
| St. Pauls Parish Federal Credit Union | Ohio |
| STP Employees Federal Credit Union | Pennsylvania |
| St. Philip's Church Federal Credit Union | New York |
| St. Pius X Church Federal Credit Union | New York |
| Straits Area Federal Credit Union | Michigan |
| Strait View Credit Union | Washington |
| Strasburg State Bank | North Dakota |
| Strategic Federal Credit Union | Virginia |
| Stratford Municipal Employees Federal Credit Union | Connecticut |
| Stratford State Bank | Wisconsin |
| Stratton Air National Guard Federal Credit Union | New York |
| Streator Community Credit Union | Illinois |
| Streator Home Savings Bank | Illinois |
| Streator Onized Credit Union | Illinois |
| Strip Steel Community Federal Credit Union | West Virginia |
| Stroehmann Employees Federal Credit Union | Pennsylvania |
| Stroud National Bank | Oklahoma |
| Struthers Federal Credit Union | Ohio |
| STSP Federal Credit Union | Louisiana |
| St. Stephen's Federal Credit Union | Texas |
| St. Tammany Federal Credit Union | Louisiana |
| St. Thomas Credit Union | Tennessee |
| St. Thomas Employee Federal Credit Union | Minnesota |
| St. Thomas More Federal Credit Union | Virginia |
| Sturdy Savings Bank | New Jersey |
| Sturgis Bank & Trust Company | Michigan |
| St. Vincent Hospital Credit Union | Massachusetts |
| St. Vincent's Medical Center Federal Credit Union | Connecticut |
| Subiaco Federal Credit Union | Arkansas |
| Suburban Federal Credit Union | Ohio |
| Success Bank | Iowa |
| Suffolk Federal Credit Union | New York |