| Code | Name | Region |
|---|---|---|
| USRU3 | Rushland | PA |
| USR5E | Rushville | IL |
| USRUH | Rushville | IN |
| USUKG | Rusk | TX |
| USRKN | Ruskin | FL |
| USROY | Royston | GA |
| USYRZ | Rozet | WY |
| USXUO | Rubidoux | CA |
| USRUB | Rubonia | FL |
| USRBY | Ruby | AK |
| USRUY | Ruby | SC |
| USRVU | Ruby Valley | NV |
| USRUK | Ruckersville | VA |
| USRDX | Rudyard | MI |
| USYRF | Ruffin | SC |
| USRFE | Ruffs Dale | PA |
| USUGG | Rugby | ND |
| USRUI | Ruidoso | NM |
| USRUL | Rule | TX |
| USRVI | Ruleville | MS |
| USRFM | Rumford | ME |
| USRFB | Rumford | RI |
| USRU8 | Rumney | NH |
| USYRJ | Rumsey | KY |
| USRUW | Rumson | NJ |
| USRWY | Rowley | UT |
| USRZM | Roxana | IL |
| USR8A | Roxana | KY |
| USRXB | Roxboro | NC |
| USRXQ | Roxbury | CT |
| USRXY | Roxbury | MA |
| US8RX | Roxbury | ME |
| US7RX | Roxbury | VT |
| USRY8 | Roy | UT |
| USRYW | Roy | WA |
| USRYA | Royal | AR |
| USRYC | Royal Center | IN |
| USXLB | Royal City | WA |
| USRYM | Royal Oak | MI |
| USFPB | Royal Palm Beach | FL |
| US9YT | Royalston | MA |
| USYAA | Royalton | MN |
| US9RT | Royalton | VT |
| USUYH | Royersford | PA |
| USRYX | Royse City | TX |
| USRL4 | Round Lake | NY |
| USUDH | Round Lake Beach | IL |
| USULP | Round Lake Park | IL |
| USROM | Round Mountain | NV |
| USRN4 | Round Pond | ME |