| Code | Name | Region |
|---|---|---|
| USITQ | Saint Thomas | MO |
| USXTM | Saint Thomas | PA |
| US8VN | Saint Vincent | MN |
| USTGN | Sainte Genevieve | MO |
| US575 | Salado | TX |
| USZIN | Salamanca | NY |
| USECK | Sale Creek | TN |
| USZSA | Salem | AL |
| USAAM | Salem | AL |
| USL26 | Salem | AR |
| US3SE | Salem | CT |
| USSLO | Salem | IL |
| USSLF | Salem | IN |
| USK2S | Salem | KY |
| USSLM | Salem | MA |
| USSMQ | Salem | MO |
| USS9L | Salem | NE |
| USIIC | Saint Michaels | MD |
| USSZZ | Saint Nazianz | WI |
| USSO4 | Saint Olaf | IA |
| USIFS | Saint Paris | OH |
| USSXW | Saint Paul | AL |
| USPAJ | Saint Paul | AR |
| US8NE | Saint Paul | IN |
| USSTP | Saint Paul | MN |
| USPA3 | Saint Paul | MO |
| USNPU | Saint Paul | OR |
| USSAL | Saint Paul | VA |
| USSNP | Saint Paul Island | AK |
| USS67 | Saint Paul Park | MN |
| USSXH | Saint Pauls | NC |
| US6TT | Saint Pete Beach | FL |
| USSIP | Saint Peter | MN |
| USSQS | Saint Peters | MO |
| USQSZ | Saint Peters | PA |
| USPIE | Saint Petersburg | FL |
| USSRE | Saint Rose | LA |
| USTSY | Saint Louisville | OH |
| USS4L | Saint Lucas | IA |
| USSL2 | Saint Lucie | FL |
| USAIT | Saint Marks | FL |
| USSJ5 | Saint Martin | MN |
| USSKM | Saint Martinville | LA |
| USKSM | Saint Marys | AK |
| USSJW | Saint Marys | GA |
| USIYQ | Saint Marys | IA |
| USINY | Saint Marys | IN |
| USYTS | Saint Marys | KS |
| USYSR | Saint Marys | KS |
| USSMR | Saint Marys | OH |