| Sabadell United Bank | Florida |
| Sabal Palm Bank | Florida |
| Sabattus Regional Credit Union | Maine |
| Sabine Federal Credit Union | Texas |
| Sabine School Employees Federal Credit Union | Louisiana |
| Sabine State Bank | Louisiana |
| SAC Federal Credit Union | Nebraska |
| Saco & Biddeford Savings Institution | Maine |
| Saco Valley Credit Union | Maine |
| Sacramento Credit Union | California |
| Sacred Heart Federal Credit Union | Louisiana |
| Sacred Heart of Corpus Christi Federal Credit Union | Pennsylvania |
| Sacred Heart Parish Hallettsville Federal Credit Union | Texas |
| Safe 1 Credit Union | California |
| SAFE Credit Union | Texas |
| SAFE Credit Union | California |
| Safe Federal Credit Union | South Carolina |
| Safe Harbor Credit Union | Michigan |
| Safeway Federal Credit Union | Washington |
| Safra National Bank of New York | New York |
| Sage Bank | Massachusetts |
| Sage Capital Bank | Texas |
| SageLink Credit Union | Michigan |
| Saginaw County Employees Credit Union | Michigan |
| Saginaw Medical Federal Credit Union | Michigan |
| SAIF Federal Credit Union | Louisiana |
| Saigon National Bank | California |
| Saint Casimir's Savings Bank | Maryland |
| Sainte Marie State Bank | Illinois |
| Saint Francis Employees Federal Credit Union | Oklahoma |
| Saint John A.M.E. Federal Credit Union | New York |
| Saint Lawrence Federal Credit Union | New York |
| Saint Nicholas Federal Credit Union | Pennsylvania |
| Saint Norbert's Credit Union | Pennsylvania |
| Saints Margaret & Gregory Federal Credit Union | Ohio |
| Saints Peter & Paul Federal Credit Union | New York |
| Saint Vincent Erie Federal Credit Union | Pennsylvania |
| Saker Shop Rite Federal Credit Union | New Jersey |
| Salal Credit Union | Washington |
| Salem Baptist Federal Credit Union | New Jersey |
| Salem Co-operative Bank | New Hampshire |
| Salem Five | Massachusetts |
| Salem Italian-American Credit Union | Massachusetts |
| Salem School System Credit Union | Illinois |
| Salem VA Medical Center Federal Credit Union | Virginia |
| Salina Interparochial Credit Union | Kansas |
| Salina Municipal Credit Union | Kansas |
| Salina Railroad Credit Union | Kansas |
| Salin Bank | Indiana |
| Saline County Teachers Credit Union | Kansas |
| Salisbury Bank | Connecticut |
| Sallie Mae Bank | Utah |
| Salt Creek Credit Union | Illinois |
| Salt Employees Federal Credit Union | Texas |
| Salyersville National Bank | Kentucky |
| Samson Banking Company | Alabama |
| San Angelo Federal Credit Union | Texas |
| San Antonio Citizens Federal Credit Union | Florida |
| San Antonio Federal Credit Union | Texas |
| San Bernardino School Employees Federal Credit Union | California |
| Sanborn Savings Bank | Iowa |
| Sandhills Bank | South Carolina |
| Sandhills Federal Credit Union | Kansas |
| Sandhills State Bank | Nebraska |
| Sandia Area Federal Credit Union | New Mexico |
| Sandia Laboratory Federal Credit Union | New Mexico |
| San Diego County Credit Union | California |
| San Diego Firefighters Federal Credit Union | California |
| San Diego Medical Federal Credit Union | California |
| San Diego Metropolitan Credit Union | California |
| San Diego Private Bank | California |
| Sandusky Ohio Edison Employee Federal Credit Union | Ohio |
| Sandy Spring Bank | Maryland |
| San Fernando Valley Japanese Credit Union | California |
| Sanford Institution for Savings | Maine |
| San Francisco Bay Area Educators Credit Union | California |
| San Francisco Federal Credit Union | California |
| San Francisco Lee Federal Credit Union | California |
| San Francisco Municipal Railway Employees Federal Credit Union | California |
| San Gabriel Valley Postal Credit Union | California |
| Sanger Bank | Texas |
| Sanibel Captiva Community Bank | Florida |
| San Joaquin Power Employees Credit Union | California |
| San Juan Credit Union | Utah |
| San Juan Mountains Credit Union | Colorado |
| San Luis Valley Federal Bank | Colorado |
| San Mateo City Employees Federal Credit Union | California |
| San Mateo Credit Union | California |
| San Patricio County Teachers Federal Credit Union | Texas |
| Santa Ana Federal Credit Union | California |
| Santa Barbara County Federal Credit Union | California |
| Santa Barbara Teachers Federal Credit Union | California |
| Santa Clara County Federal Credit Union | California |
| Santa Cruz Community Credit Union | California |
| Santa Cruz County Bank | California |
| Santa Fe Federal Credit Union | Texas |
| Santa Maria Associated Employees Federal Credit Union | California |
| San Tan Credit Union | Arizona |
| Santander Bank | Delaware |
| Santa Rosa County Federal Credit Union | Florida |