| Code | Name | Region |
|---|---|---|
| USSVG | Suwanee | GA |
| USS8E | Suwannee | FL |
| USSWJ | Swainsboro | GA |
| USUSW | Swampscott | MA |
| US6SL | Swan Lake | NY |
| USSQ2 | Swan Quarter | NC |
| USVXA | Swan Valley | ID |
| USSNO | Swannanoa | NC |
| USIS9 | Swans Island | ME |
| USSW6 | Swansea | IL |
| USUIQ | Suquamish | WA |
| USUIY | Surf City | NC |
| USSC5 | Surf City | NJ |
| USFUF | Surfside | FL |
| USFBC | Surfside Beach | SC |
| USSGO | Surgoinsville | TN |
| USSGZ | Suring | WI |
| USURS | Surprise | AZ |
| USRRU | Surrency | GA |
| US8RR | Surry | ME |
| USQRY | Surry | VA |
| USSVE | Susanville | CA |
| USUIT | Susitna | AK |
| USSH7 | Susquehanna | PA |
| USUEX | Sussex | NJ |
| USSSY | Sussex | WI |
| USSV6 | Sutersville | PA |
| USUEN | Sutherland | NE |
| USZSD | Sutherland | VA |
| USSLD | Sutherlin | OR |
| USUNR | Sunray | TX |
| USXUN | Sunrise | FL |
| USZZZ | Sunrise Beach | MO |
| USSNC | Sunset | CA |
| USSU6 | Sunset | LA |
| USSS4 | Sunset | UT |
| USSBE | Sunset Beach | CA |
| USS99 | Sunset Beach | NC |
| USUEA | Sunset Hills | MO |
| USS8L | Sunset Valley | TX |
| USSWE | Sunset Whitney Ranch | CA |
| USSHA | Sunshine | AL |
| US9SH | Sunshine | LA |
| USAZ3 | Superior | AZ |
| US9OQ | Superior | CO |
| USUPR | Superior | NE |
| USSUW | Superior | WI |
| USST8 | Superior Township | MI |
| USLQF | Supply Brunswick County | NC |
| USSYX | Supreme | LA |