| Code | Name | Region |
|---|---|---|
| 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 |
| USRRX | Round Rock | TX |
| USRQT | Round Top | TX |
| USRPX | Roundup | MT |
| USRSX | Rouses Point | NY |
| USRYV | Rouseville | PA |
| USRWB | Rowan Bay | AK |
| US9WE | Rowe | MA |
| USRWV | Rowe | VA |
| USR5W | Rowena | SD |
| USRZW | Rowena | TX |
| USXLK | Rowesville | SC |
| USRHW | Rowland Heights | CA |
| USZRE | Rowlett | TX |
| USRL3 | Rowley | IA |
| USRY2 | Rowley | MA |
| USRSO | Rossford | OH |
| USRRY | Rossmoor | CA |
| USYVS | Rosston | OK |
| USRSS | Rossville | GA |
| USRXL | Rossville | IL |
| USR2S | Rossville | IN |
| USRI3 | Rossville | KS |
| USROQ | Rossville | TN |
| US7T7 | Rossville | TX |
| USRWE | Roswell | GA |
| USROW | Roswell | NM |
| USRTX | Rotan | TX |
| USRYR | Rothbury | MI |
| USRTS | Rothschild | WI |
| USR2E | Rothsville | PA |