| Code | Name | Region |
|---|---|---|
| USZSI | San Acacio | CO |
| USSA7 | San Andreas | CA |
| USSJT | San Angelo | TX |
| USDLM | San Anselmo | CA |
| USAT8 | San Antonio | FL |
| USSA5 | San Antonio | NM |
| USSAT | San Antonio | TX |
| USSLS | Salisbury | MA |
| USSBY | Salisbury | MD |
| USISU | Salisbury | MO |
| USSRW | Salisbury | NC |
| USSY6 | Salisbury | NH |
| USIUR | Salisbury | PA |
| US8VT | Salisbury | VT |
| USYLS | Salisbury Mills | NY |
| USJLL | Salley | SC |
| USSIZ | Sallis | MS |
| USSLA | Sallisaw | OK |
| USSMN | Salmon | ID |
| USZOM | Salome | AZ |
| USTFP | Salt Flat | TX |
| USSLC | Salt Lake City | UT |
| USTLP | Salt Point | NY |
| USSLL | Saltillo | MS |
| USS2T | Saltillo | TN |
| USS7O | Saltillo | TX |
| USSAS | Salton City | CA |
| USSXA | Salem | NH |
| USSEM | Salem | NJ |
| USJSM | Salem | NM |
| USL7S | Salem | NY |
| USSAE | Salem | OH |
| USSLE | Salem | OR |
| USS29 | Salem | SC |
| USQLM | Salem | SD |
| USZLM | Salem | UT |
| USUYQ | Salem | VA |
| USMBO | Salem | WV |
| USS2B | Salemburg | NC |
| USQVE | Salesville | OH |
| USZIG | Salida | CA |
| USSLT | Salida | CO |
| USSLN | Salina | KS |
| USSBO | Salina | UT |
| USSNS | Salinas | CA |
| USSJI | Saline | MI |
| USZYS | Salisbury | CT |
| USAIP | Saint Rose Plantation | LA |
| USSSS | Saint Simons Island | GA |
| USZSH | Saint Stephen | SC |