| Code | Name | Region |
|---|---|---|
| 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 |
| USABT | Sabattus | ME |
| USZHB | Sabetha | KS |
| USIAI | Sabillasville | MD |
| US4IN | Sabin | MN |
| USSBB | Sabina | OH |
| USUSJ | Sabinal | TX |
| USSAB | Sabine | TX |
| USNSS | Sabine Pass | TX |
| USJTY | Sac City | IA |
| USSX2 | Sachse | TX |
| USQSK | Saco | ME |
| USSAC | Sacramento | CA |
| US9SR | Sacramento | KY |
| USTKG | Sacramento | PA |
| USDHR | Sacred Heart | MN |
| USSBK | Saddle Brook | NJ |
| USRSN | Ruston | LA |
| USR2H | Ruth | MI |
| USR8H | Ruth | NV |
| USRVG | Ruther Glen | VA |