| Code | Name | Region |
|---|---|---|
| USS7T | Saint Charles | MO |
| USABP | Saint Charles | MO |
| USSCL | Saint Clair | MI |
| USSKZ | Saint Clair | PA |
| USST7 | Saint Clair | PA |
| USCS4 | Saint Clair Shores | MI |
| USLIK | Saint Clair, Franklin | MO |
| USIJE | Sagle | ID |
| USXSG | Sagola | MI |
| USSAG | Sagwon | AK |
| USSR6 | Sahuarita | AZ |
| USYTG | Saint Agatha | ME |
| US7IN | Saint Albans | ME |
| USTBA | Saint Albans | MO |
| USTDA | Saint Albans | NY |
| USSTA | Saint Albans | VT |
| USSA3 | Saint Albans | WV |
| USIVQ | Saint Albans Bay | VT |
| US4SA | Saint Amant | LA |
| USS2A | Saint Andrews | SC |
| USS3A | Saint Andrews | SC |
| USSA4 | Saint Ann | MO |
| USSE7 | Saint Anne | IL |
| USJSS | Saint Ansgar | IA |
| USS7A | Saint Anthony | ID |
| USAAY | Saint Anthony | IN |
| USOSJ | Saint Anthony | MN |
| USRV4 | Saddle River | NJ |
| USSD6 | Sadorus | IL |
| USUDV | Sadsburyville | PA |
| USXLL | Saegertown | PA |
| USSFP | Safety Harbor | FL |
| USSAD | Safford | AZ |
| US2SH | Sag Harbor | NY |
| USGXH | Sag Harbor | NY |
| USTX4 | Sagamore | MA |
| USG9C | Sagamore Beach | MA |
| USSJH | Sagamore Hills | OH |
| USSP2 | Sagaponack | NY |
| USSLJ | Sage | CA |
| USSAI | Saginaw | AL |
| USSGM | Saginaw | MI |
| USGS3 | Saginaw | MN |
| USAGA | Saginaw | OR |
| USSJQ | Saginaw | TX |
| USSGW | Saginaw Bay | AK |
| USRH6 | Rye Beach | NH |
| USRRK | Rye Brook | NY |
| USG5T | Ryegate | VT |
| USZBR | S.burlington | VT |