| Code | Name | Region |
|---|---|---|
| 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 |
| USRAJ | Rotterdam | NY |
| USRJN | Rotterdam Junction | NY |
| USRTD | Rotunda | FL |
| USRUC | Round Lake | IL |
| USRL2 | Round Lake | MN |
| USR9T | Roseto | PA |
| USRJT | Roseton | NY |
| USRVC | Roseville | CA |
| USRSV | Roseville | MI |
| USRVE | Roseville | MN |
| USRV9 | Roseville | NC |
| USROS | Roseville | OH |
| USRHQ | Rosharon | TX |
| USOSO | Rosholt | SD |
| USR2T | Rosholt | WI |
| USRO9 | Rosiclaire | IL |
| USRSK | Rosiclare | IL |
| USRZD | Roslindale | MA |
| USYL8 | Roslyn | NY |
| USRYN | Roslyn Heights | NY |