| Code | Name | Region |
|---|---|---|
| USYZR | Sandy Spring | MD |
| USYSG | Sandy Springs | GA |
| USAYP | Sandy Springs | SC |
| USDV7 | Sandy Valley | NV |
| USSF6 | Sanford | CA |
| USS9F | Sanford | CO |
| USSFB | Sanford | FL |
| USDCE | Sand Coulee | MT |
| USS24 | Sand Fork | WV |
| USSD7 | Sand Hills | TX |
| USQDK | Sand Lake | FL |
| USSDP | Sand Point | AK |
| USSDQ | Sand Springs | OK |
| USDHK | Sanders | AZ |
| USSDI | Sanderson | FL |
| USDSA | Sanderson | TX |
| USSNV | Sandersville | GA |
| US3SF | Sandford | IN |
| USDIP | Sandia Park | NM |
| US6SD | Sandisfield | MA |
| USBMH | Sandoval | IL |
| USS8A | Sandown | NH |
| USNDP | Sandpoint | ID |
| USZDS | Sands Point | NY |
| USSAX | Sandston | VA |
| USZNS | Sandstone | MN |
| USSDW | Sandusky | MI |
| USSMC | San Marcos | TX |
| USSMD | San Marino | CA |
| USSXJ | San Martin | CA |
| USSXF | San Mateo | CA |
| USSYL | San Miguel | CA |
| USSAK | San Pablo | CA |
| USSPQ | San Pedro | CA |
| USQT2 | San Quentin | CA |
| USSRF | San Rafael | CA |
| USSJB | San Ramon | CA |
| USZSS | San Saba | TX |
| USZVP | San Tan Valley | AZ |
| USYGC | San Ygnacio | TX |
| USSYO | San Ysidro | CA |
| USYSO | San Ysidro | NM |
| USZOJ | Sanborn | IA |
| USNBQ | Sanborn | NY |
| USSZ2 | Sanbornton | NH |
| USSV2 | Sanbornville | NH |
| USSDC | Sand City | CA |
| USJNO | San Jacinto | CA |
| USJOQ | San Joaquin | CA |
| USANJ | San Joaquin River | CA |