| Code | Name | Region |
|---|---|---|
| USEZY | Shrewsbury | NJ |
| USQSY | Shrewsbury | PA |
| USQZY | Shrewsbury | WV |
| USS5L | Shroon | NY |
| USSHK | Shrub Oak | NY |
| USSUB | Shubuta | MS |
| USHJB | Shullsburg | WI |
| USUWX | Shumway | IL |
| USSHG | Shungnak | AK |
| USHQK | Shuqualak | MS |
| USUY9 | Shutesbury | MA |
| USPS4 | Siberia | IN |
| USZSL | Sibley | IA |
| USS5B | Sibley | LA |
| USIBZ | Sibley | MO |
| USIYD | Sicily Island | LA |
| USSV5 | Sicklerville | NJ |
| USSD3 | Sidell | IL |
| USXLZ | Shoreham | NY |
| USSRH | Shoreham | VT |
| USSRI | Shoreline | WA |
| USSHB | Shoreview | MN |
| USSW3 | Shorewood | IL |
| USDO9 | Shorewood | MN |
| USSJV | Shorewood | OR |
| USS9W | Shorewood | WI |
| USXSY | Short Hills | NJ |
| USEOH | Shorter | AL |
| USTRV | Shorterville | AL |
| USSS8 | Shortsville | NY |
| USHQS | Shoshone | CA |
| USOHZ | Shoshone | ID |
| USGL5 | Shoshone County | ID |
| USSN4 | Shoshoni | WY |
| USSOW | Show Low | AZ |
| USSIH | Showell | MD |
| USSKO | Showhegan | ME |
| USOHS | Shreve | OH |
| USS3O | Shingletown | CA |
| USSKF | Shinnston | WV |
| USSBQ | Ship Bottom | NJ |
| USIPX | Ship Island | MS |
| USSSG | Shippensburg | PA |
| USYNV | Shippenville | PA |
| USZHP | Shippingport | PA |
| USS2P | Shipshewana | IN |
| USSVF | Shiremanstown | PA |
| USSJR | Shirley | MA |
| USWSH | Shirley | NY |
| USSB6 | Shirleysburg | PA |