| Code | Name | Region |
|---|---|---|
| USABT | Sabattus | ME |
| USZHB | Sabetha | KS |
| USIAI | Sabillasville | MD |
| US4IN | Sabin | MN |
| USSBB | Sabina | OH |
| USUSJ | Sabinal | TX |
| USSAB | Sabine | TX |
| USNSS | Sabine Pass | TX |
| USJTY | Sac City | IA |
| USSX2 | Sachse | TX |
| USQSK | Saco | ME |
| USSAC | Sacramento | CA |
| US9SR | Sacramento | KY |
| USTKG | Sacramento | PA |
| USDHR | Sacred Heart | MN |
| USSBK | Saddle Brook | NJ |
| USRSN | Ruston | LA |
| USR2H | Ruth | MI |
| USR8H | Ruth | NV |
| USRVG | Ruther Glen | VA |
| USRTH | Rutherford | CA |
| USUYI | Rutherford | NJ |
| USZUT | Rutherford | TN |
| USRC2 | Rutherford College | NC |
| USRUR | Rutherfordton | NC |
| USRT7 | Rutland | MA |
| USRUT | Rutland | VT |
| USRUA | Rutledge | GA |
| USR2U | Rutledge | MO |
| USR7T | Rutledge | TN |
| USRYH | Ryan | OK |
| USYYA | Rydal | GA |
| USRYB | Ryde | CA |
| USRYJ | Rye | NH |
| USZRY | Rye | NY |
| USRYZ | Rye | TX |
| USRXN | Ruskin | NE |
| USZG2 | Russell | IL |
| USRSL | Russell | KS |
| USRKU | Russell | KY |
| USUSL | Russell | MA |
| USUED | Russell | MN |
| USRZL | Russell | WA |
| USRUP | Russell Springs | KS |
| USRS5 | Russell Springs | KY |
| USRUO | Russells Point | OH |
| USRUV | Russellville | AL |
| USRUS | Russellville | AR |
| USV9L | Russellville | IL |
| USUVI | Russellville | IN |