| Code | Name | Region |
|---|---|---|
| USSEZ | Seatac | WA |
| USSEA | Seattle | WA |
| USS6E | Seaview | WA |
| US8SB | Sebago | ME |
| USYKQ | Sebago Lake | ME |
| USSZG | Sebastian | FL |
| USXNB | Sebastian | TX |
| USSYD | Sebastopol | CA |
| USXLO | Sebastopol | MS |
| USSWB | Sebewaing | MI |
| USYSB | Sebree | KY |
| USSEF | Sebring | FL |
| USSEB | Sebring | OH |
| USSC4 | Secane | PA |
| USUYK | Secaucus | NJ |
| USOZQ | Secor | IL |
| USS4E | Section | AL |
| USZSY | Security | CO |
| USSEO | Seabrook | TX |
| USXLR | Seadrift | TX |
| USSFE | Seaford | DE |
| USQSF | Seaford | NY |
| USSVI | Seagoville | TX |
| USSGK | Seagraves | TX |
| USEOV | Seagrove | NC |
| USSYB | Seal Bay | AK |
| USSLH | Seal Beach | CA |
| US9VE | Seal Cove | ME |
| USZRK | Seal Rock | OR |
| USAQE | Seale | AL |
| USSLY | Sealy | TX |
| USSRC | Searcy | AR |
| USSL5 | Searles | CA |
| USS3S | Sears | MI |
| USJUR | Searsburg | VT |
| USSM4 | Searsmont | ME |
| USSRP | Searsport | ME |
| USXLU | Seaside | CA |
| USOZG | Scottsburg | VA |
| USSTZ | Scottsdale | AZ |
| USSCV | Scottsville | KY |
| USOTV | Scottsville | NY |
| USSZF | Scottsville | TX |
| USTTS | Scottsville | VA |
| USSCN | Scottville | MI |
| USRRA | Scranton | AR |
| USS53 | Scranton | IA |
| USDCN | Scranton | ND |
| USSCR | Scranton | PA |
| USSCB | Scribner | NE |