| Code | Name | Region |
|---|---|---|
| USRS7 | Rosman | NC |
| USRZO | Ross | CA |
| USRS4 | Ross | OH |
| USR8G | Rossburg | OH |
| USRR2 | Rosser | TX |
| USROZ | Rosedale | NJ |
| USRDQ | Rosedale | NY |
| USXRL | Roseland | LA |
| USRLB | Roseland | NJ |
| USRJZ | Roseland | VA |
| USOEW | Roselawn | IN |
| USRLL | Roselle | IL |
| USRLE | Roselle | NJ |
| USZH2 | Roselle Park | NJ |
| USYFM | Rosemary Beach | FL |
| USRFS | Rosemead | CA |
| USRSI | Rosemont | IL |
| USQRM | Rosemont | NJ |
| USROP | Rosemont | PA |
| USRMM | Rosemount | MN |
| USRSG | Rosenberg | TX |
| USOJE | Rosendale | NY |
| USROD | Rosendale | WI |
| USRON | Rosenhayn | NJ |
| USRZP | Rosepine | LA |
| USRSQ | Roscoe | IL |
| USR5C | Roscoe | NY |
| USUOE | Roscoe | TX |
| USRCQ | Roscommon | MI |
| USRB9 | Rose Bud | AR |
| USREC | Rose City | MI |
| USQOI | Rose City | TX |
| US7RH | Rose Hill | KS |
| USRZH | Rose Hill | NC |
| USROX | Roseau | MN |
| USRSB | Roseboro | NC |
| USRBZ | Rosebud | MO |
| USIUD | Rosebud | TX |
| USRBG | Roseburg | OR |
| USB8H | Rosebush | MI |
| USRDA | Rosedale | AR |
| USRN9 | Rosedale | IN |
| USZED | Rosedale | KS |
| USRSA | Rosedale | MD |
| USRAE | Rosedale | MS |
| USROU | Romulus | MI |
| USRUZ | Romulus | NY |
| USRNW | Ronan | MT |
| USROT | Ronceverte | WV |
| USQDA | Ronda | NC |