| Code | Name | Region |
|---|---|---|
| US9SB | Starbuck | MN |
| USXMU | Starke | FL |
| US7SB | Starksboro | VT |
| USSXK | Starkville | MS |
| USRL5 | Starlight | IN |
| USXAR | Starr | SC |
| USXMT | Startex | SC |
| USSU2 | Startup | WA |
| USSCE | State College | PA |
| USTTI | Stateline | NV |
| USUYU | Staten Island | NY |
| USTBR | Statesboro | GA |
| USSVH | Statesville | NC |
| USZIQ | Statesville | VA |
| USST3 | Statham | GA |
| USUNT | Staunton | IL |
| USSHD | Staunton | VA |
| USSAY | Stayton | OR |
| USWSB | Steamboat Bay | AK |
| USNZK | Stanton | IA |
| 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 |