| Code | Name | Region |
|---|---|---|
| USQSN | South Easton | MA |
| USSDM | South El Monte | CA |
| USSE2 | South Elgin | IL |
| USS3C | South Euclid | OH |
| USQPZ | South Fallsburg | NY |
| USSF4 | South Fork | PA |
| USSGC | South Gate | CA |
| USOUG | South Gate | FL |
| USYSY | South Glastonbury | CT |
| USJGF | South Glens Falls | NY |
| USSOQ | South Grafton | MA |
| USHKS | South Hackensack/new Jersey | NJ |
| USSYM | South Hadley | MA |
| USZYX | South Hamilton | MA |
| USZJX | South Hampton | NH |
| USSOH | South Haven | MI |
| USH77 | South Haven | MN |
| USUYT | South Haven | MS |
| USUHA | South Heart | ND |
| USSBL | South Beloit | IL |
| USSBN | South Bend | IN |
| USS3B | South Bend | LA |
| USACJ | South Bend | WA |
| USZYW | South Berwick | ME |
| USHH4 | South Bethlehem | NY |
| USTBM | South Boardman | MI |
| USSBC | South Boston | MA |
| USSOG | South Boston | VA |
| USS8B | South Bristol | ME |
| USXLN | South Brunswick | NJ |
| USQSB | South Burlington | VT |
| USCQ2 | South Canaan | PA |
| USOUL | South Charleston | OH |
| USSCT | South Charleston | WV |
| USOUS | South Chicago Heights | IL |
| USODT | South Dartmouth | MA |
| USSOI | South Dayton | NY |
| US8DA | South Daytona | FL |
| USDDF | South Deerfield | MA |
| USKTY | Sonora | KY |
| US7TS | Sonora | TX |
| USQS3 | Soperton | GA |
| USSAZ | Sophia | NC |
| USS9O | Sophia | WV |
| USSQQ | Soquel | CA |
| USOET | Sorrento | CA |
| USRRN | Sorrento | FL |
| USS9R | Sorrento | LA |
| US9SO | Sorrento | ME |
| USSOT | Souderton | PA |