| Code | Name | Region |
|---|---|---|
| USSQG | Shelbyville | MO |
| USSYI | Shelbyville | TN |
| USIYE | Shelbyville | TX |
| USSEI | Sheldon | IA |
| USSQP | Sheldon | MO |
| USXMB | Sheldon | TX |
| US7SH | Sheldon | VT |
| USZ4X | Sheldon | WI |
| USSHC | Shawnee | KS |
| USSNL | Shawnee | OK |
| USSM2 | Shawnee Mission | KS |
| US8SD | Shawnee On Delaware | PA |
| USSBM | Sheboygan | WI |
| USSBF | Sheboygan Falls | WI |
| USYSD | Shedd | OR |
| USSMU | Sheep Mountain | AK |
| USSHF | Sheffield | AL |
| USSED | Sheffield | IA |
| US6FL | Sheffield | IL |
| USQSH | Sheffield | MA |
| USHEI | Sheffield | OH |
| USS5D | Sheffield | PA |
| US7SE | Sheffield | VT |
| USSL9 | Sheffield Lake | OH |
| USHFG | Sheffield Village | OH |
| USSB8 | Shelburne | VT |
| USHFS | Shelburne Falls | MA |
| USISY | Shelby | IA |
| USCXZ | Sharon Center | OH |
| USSHL | Sharon Hill | PA |
| USSHS | Sharon Springs | NY |
| USXMA | Sharonville | OH |
| USS22 | Sharpes | FL |
| US3SG | Sharpsburg | KY |
| USRPB | Sharpsburg | NC |
| USS7G | Sharpsburg | PA |
| USI9H | Sharpsville | IN |
| USSJS | Sharpsville | PA |
| USSL8 | Shartlesville | PA |
| US4SC | Shasta | CA |
| USS9K | Shasta Lake | CA |
| USSUK | Shattuck | OK |
| US2SL | Shaver Lake | CA |
| USS9V | Shavertown | PA |
| USJXS | Shaw | MS |
| USZFH | Shaw Air Force Base | SC |
| USSWS | Shawano | WI |
| USUSM | Shawmut | ME |
| USSR4 | Shalimar | FL |
| USSLX | Shallotte | NC |