| Service 1 Federal Credit Union | Michigan |
| Service 1st Credit Union | Texas |
| Service 1st Credit Union Credit Union | Florida |
| Service 1st Federal Credit Union | Pennsylvania |
| Service Credit Union | Wisconsin |
| Service Credit Union | New Hampshire |
| Service First Federal Credit Union | South Dakota |
| Service One Credit Union | Kentucky |
| Service Plus Credit Union | Illinois |
| Services Center Federal Credit Union | South Dakota |
| Service Station Dealers Federal Credit Union | Pennsylvania |
| ServisFirst Bank | Alabama |
| ServU Federal Credit Union | New York |
| SESLOC Federal Credit Union | California |
| Settlers Bank | Wisconsin |
| Settlers Federal Credit Union | Michigan |
| Seven Seventeen Credit Union | Ohio |
| Severn Savings Bank | Maryland |
| Sevier County Bank | Tennessee |
| Sevier County Schools Federal Credit Union | Tennessee |
| Sewerage & Water Board Employees Federal Credit Union | Louisiana |
| Sewickley Savings Bank | Pennsylvania |
| SF Police Credit Union | California |
| SF Recreation and Parks Federal Credit Union | California |
| SHACOG Federal Credit Union | Pennsylvania |
| Shaker Heights Federal Credit Union | Ohio |
| Shamrock Bank | Oklahoma |
| Shamrock Federal Credit Union | Texas |
| Shamrock Foods Federal Credit Union | Arizona |
| Share Advantage Credit Union | Minnesota |
| Shared Resources Credit Union | Texas |
| Sharefax Credit Union | Ohio |
| Sharepoint Credit Union | Minnesota |
| Sharon Credit Union | Massachusetts |
| Sharon Savings Bank | Pennsylvania |
| Sharonview Federal Credit Union | South Carolina |
| Shawnee TVA Employees Federal Credit Union | Kentucky |
| Shaw-Ross Employees Credit Union | Florida |
| Shaw University Federal Credit Union | North Carolina |
| Sheboygan Area Credit Union | Wisconsin |
| Sheet Metal Workers Federal Credit Union | Indiana |
| Shelby/Boliver County Federal Credit Union | Mississippi |
| Shelby Community Federal Credit Union | Montana |
| Shelby County Federal Credit Union | Tennessee |
| Shelby County State Bank | Iowa |
| Shelby County State Bank | Illinois |
| Shelby Savings Bank | Texas |
| Shell Community Federal Credit Union | Illinois |
| Shell Federal Credit Union | Texas |
| Shell Geismar Federal Credit Union | Louisiana |
| Shell Lake State Bank | Wisconsin |
| Shell Western States Federal Credit Union | California |
| Shelter Insurance Federal Credit Union | Missouri |
| Shenango China Area Federal Credit Union | Pennsylvania |
| Sherburne State Bank | Minnesota |
| Sherchem Federal Credit Union | Ohio |
| Sheridan Community Federal Credit Union | Wyoming |
| Sheridan State Bank | Illinois |
| Sherwin Federal Credit Union | Texas |
| Sherwin-Williams Credit Union | Illinois |
| Sherwood Community Bank | Missouri |
| Shiloh Baptist Federal Credit Union | Illinois |
| Shiloh Englewood Federal Credit Union | Illinois |
| Shinhan Bank America | New York |
| Shipbuilders Credit Union | Wisconsin |
| Shore Bank | Virginia |
| Shore Community Bank | New Jersey |
| Shoreline Credit Union | Wisconsin |
| Shoreline Federal Credit Union | Michigan |
| Shore to Shore Community Federal Credit Union | Michigan |
| Show Me Credit Union | Missouri |
| SHPE Federal Credit Union | Louisiana |
| Shreveport Federal Credit Union | Louisiana |
| Shreveport Police Federal Credit Union | Louisiana |
| Shrewsbury Federal Credit Union | Massachusetts |
| Shuford Federal Credit Union | North Carolina |
| Shyann Federal Credit Union | Wyoming |
| Sibley State Bank | Iowa |
| Sicily Island State Bank | Louisiana |
| Sidney Federal Credit Union | New York |
| Sidney Federal Savings and Loan Association | Nebraska |
| Sidney State Bank | Michigan |
| SI Employees Federal Credit Union | New York |
| Sierra Central Credit Union | California |
| Sierra Pacific Federal Credit Union | Nevada |
| Sierra Point Credit Union | California |
| Sierra Vista Bank | California |
| Signal Financial Federal Credit Union | Maryland |
| Signature Bank | New York |
| Signature Bank | Ohio |
| Signature Bank | Minnesota |
| Signature Bank | Illinois |
| Signature Bank of Arkansas | Arkansas |
| Signature Bank of Georgia | Georgia |
| Signet Federal Credit Union | Kentucky |
| Sikeston Public Schools Credit Union | Missouri |
| Sikorsky Financial Credit Union | Connecticut |
| Silex Banking Company | Missouri |
| Silgan White Cap Credit Union | Illinois |
| Silicon Valley Bank | California |