| Code | Name | Region |
|---|---|---|
| USSX8 | Stanton | KY |
| US7ST | Stanton | MI |
| USSYN | Stanton | MN |
| USZJA | Stanton | MO |
| USSO7 | Stanton | TN |
| USSTX | Stanton | TX |
| US2SB | Stantonsburg | NC |
| USTV8 | Stantonville | TN |
| USS4V | Stanville | KY |
| USQTD | Stanwood | MI |
| USSNW | Stanwood | WA |
| USVVK | Staples | MN |
| USVSQ | Stapleton | AL |
| USTAE | Stapleton | GA |
| USTPN | Stapleton | NE |
| USS5R | Star | ID |
| USQSA | Star | MS |
| USYRX | Star | NC |
| USKTA | Star | TX |
| US5SC | Standard | CA |
| USTDH | Standish | ME |
| USSH6 | Standish | MI |
| USTFD | Stanfield | AZ |
| USSF5 | Stanfield | NC |
| USSF8 | Stanfield | OR |
| USTNQ | Stanford | CA |
| USTAN | Stanford | KY |
| USJDV | Stanfordville | NY |
| USSTN | Stanhope | NJ |
| USST4 | Stanley | ID |
| USUZA | Stanley | NC |
| USS5Y | Stanley | ND |
| USEYZ | Stanley | NY |
| USSYJ | Stanley | VA |
| USNYL | Stanley | WI |
| USSZT | Stanleytown | VA |
| USSR9 | Stansbury Park | UT |
| USSTI | Stanton | CA |
| USS8D | Stanton | DE |
| USP4T | St. Petersburg | PA |
| USGB8 | Staatsburg | NY |
| USKSY | Stacy | MN |
| USTVX | Stacyville | IA |
| USJCU | Stafford | CT |
| USVSZ | Stafford | KS |
| USXTF | Stafford | NY |
| USSTD | Stafford | TX |
| USSTB | Stafford | VA |
| USSFC | Stafford Springs | CT |
| USV3R | Stain George | VT |