| Code | Name | Region |
|---|---|---|
| USSSK | Southampton | NY |
| USSJL | Southampton | PA |
| USSSF | Southard | OK |
| USSVQ | Southaven | MS |
| USSZV | Southborough | MA |
| USTHD | Southbridge | MA |
| USSBU | Southbury | CT |
| USSOP | Southern Pines | NC |
| USSFX | Southfield | MA |
| USSR3 | South Rockwood | MI |
| USRXS | South Roxana | IL |
| USYLN | South Royalton | VT |
| USSPT | South Saint Paul | MN |
| USTDQ | South Salem | NY |
| USS8K | South Salt Lake | UT |
| USSYF | South San Francisco | CA |
| USSSH | South Shore | KY |
| USSSO | South Sioux City | NE |
| USS8S | South Solon | OH |
| USS2S | South Sumter | SC |
| US9SA | South Thomaston | ME |
| USUT3 | South Tucson | AZ |
| USYSU | South Union | KY |
| USSV8 | South Vienna | OH |
| USOUW | South Wales | NY |
| USQSW | South Walpole | MA |
| USOHJ | South Wayne | WI |
| USWWB | South Webster | OH |
| USS5W | South Wellfleet | MA |
| USWSN | South Naknek | AK |
| USS88 | South Natick | MA |
| USSON | South Norwalk | CT |
| US2OG | South Ogden | UT |
| USTHX | South Orange | NJ |
| USOZN | South Ozone Park | NY |
| USPXD | South Padre Island | TX |
| USSSA | South Paris | ME |
| USS98 | South Park | PA |
| USSSD | South Pasadena | CA |
| USSSQ | South Pierce | FL |
| USSWU | South Pittsburg | TN |
| USSFD | South Plainfield | NJ |
| USN7Y | South Plymouth | NY |
| USSPH | South Point | OH |
| USSOX | South Portland | ME |
| USS3P | South Prairie | WA |
| USSSP | South Range | MI |
| USSST | South River | MO |
| USSSE | South River | NJ |
| US7HE | South Hero | VT |