| Code | Name | Region |
|---|---|---|
| USSY2 | Sayre | OK |
| USAYJ | Sayre | PA |
| USXNA | Sayreville | NJ |
| USSYS | Sayville | NY |
| USQJZ | Scales Mound | IL |
| USZVN | Scammon | KS |
| USSCM | Scammon Bay | AK |
| USSC9 | Scanlon | MN |
| USSSM | Sault Sainte Marie | MI |
| USZUN | Saunderstown | RI |
| USJMC | Sausalito | CA |
| US9SN | Sautee Nacoochee | GA |
| USSGE | Savage | MD |
| USXLY | Savage | MN |
| USVGE | Savage | MT |
| USSNQ | Savanna | IL |
| USSAV | Savannah | GA |
| USSA8 | Savannah | MO |
| USXMX | Savannah | NY |
| USSH8 | Savannah | OH |
| USTSA | Savannah | TN |
| USVEJ | Saverton | MO |
| USS6Y | Savery | WY |
| USSVA | Savoonga | AK |
| USSYG | Savoy | IL |
| US6SV | Savoy | MA |
| USOYT | Savoy | TX |
| USXYZ | Sawmills | NC |
| USA98 | Sarona | WI |
| USSL4 | Sartell | MN |
| USSJ9 | Sarver | PA |
| USSAQ | Sasabe | AZ |
| USSAH | Sasser | GA |
| USS9T | Satanta | KS |
| USLTB | Satellite Beach | FL |
| USSY5 | Saticoy | CA |
| USZOP | Satsop | WA |
| US2S2 | Satsuma | AL |
| USS2R | Saucier | MS |
| USSUV | Saugerties | NY |
| USSAU | Sauget | IL |
| USUGU | Saugus | CA |
| USUGX | Saugus | MA |
| USSC2 | Sauk Centre | MN |
| USSC3 | Sauk City | WI |
| USSRA | Sauk Rapids | MN |
| USSXL | Sauk Village | IL |
| USVVV | Saukville | WI |
| USS7P | Sapphire | NC |
| USAPU | Sapulpa | OK |