| Code | Name | Region |
|---|---|---|
| USSBA | Santa Barbara | CA |
| USSCZ | Santa Clara | CA |
| USTCM | Santa Clara | NM |
| USSKR | Santa Clara | UT |
| USSAM | Santa Clarita | CA |
| USSC6 | Santa Claus | IN |
| USSRU | Santa Cruz | CA |
| USSKY | Sandusky, Erie | OH |
| USSWH | Sandwich | IL |
| USSWC | Sandwich | MA |
| USSJD | Sandy | OR |
| USSJE | Sandy | UT |
| USSY3 | Sandy Creek | NY |
| USYHO | Sandy Hook | CT |
| USSO8 | Sandy Hook | MS |
| USAYL | Sandy Lake | PA |
| USSYP | Sandy Point | ME |
| USIW9 | Sandy Ridge | NC |
| USKSR | Sandy River | AK |
| USS3R | Sandy Run | SC |
| 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 |