| Code | Name | Region |
|---|---|---|
| US7OL | Sea Cliff | NY |
| USGXI | Sea Girt | NJ |
| USQSI | Sea Island | GA |
| USSK8 | Seabeck | WA |
| USS7B | Seaboard | NC |
| USEBK | Seabrook | NH |
| USSBJ | Seabrook | NJ |
| USEQQ | Seabrook | SC |
| USSOA | Scotia | NY |
| US9SD | Scotland | PA |
| USSO2 | Scotland | SD |
| USSCD | Scotland Neck | NC |
| USZKO | Scott | LA |
| USXOT | Scott | MS |
| USSB3 | Scott Air Force Base | IL |
| USZSN | Scott City | KS |
| USSCQ | Scott City | MO |
| USDZQ | Scott Depot | WV |
| USS7M | Scott Mills | OR |
| USTW6 | Scott Township | PA |
| USSZD | Scottdale | GA |
| USSZE | Scottdale | PA |
| USXOS | Scotts | MI |
| USS4H | Scotts Hill | TN |
| USSV4 | Scotts Valley | CA |
| USBFF | Scottsbluff | NE |
| USSQB | Scottsboro | AL |
| USSSZ | Scottsburg | IN |
| USS9C | Schriever | LA |
| USSBW | Schulenburg | TX |
| USSHJ | Schuyler | NE |
| USSE6 | Schuyler | VA |
| USSV3 | Schuylerville | NY |
| USSKL | Schuylkill | PA |
| USSKU | Schuylkill Haven | PA |
| USH7A | Schuylkill Haven | PA |
| USS77 | Schwenksville | PA |
| USHL9 | Science Hill | KY |
| USS44 | Scio | OR |
| US2SV | Sciotoville | OH |
| USIJC | Scipio Center | NY |
| USSCU | Scituate | MA |
| USSCO | Scobey | MT |
| USSCW | Scobeyville | NJ |
| USXLQ | Scofield | UT |
| USM8S | Scooba | MS |
| USSPJ | Scotch Plains | NJ |
| USSIA | Scotia | CA |
| USSCA | Scappoose | OR |
| USSZX | Scarborough | ME |