| Code | Name | Region |
|---|---|---|
| USRC3 | Rice | MN |
| USRJI | Rice | TX |
| US2V2 | Rice | VA |
| USRIE | Rice Lake | WI |
| USRCG | Riceboro | GA |
| USP44 | Riceville | IA |
| USICV | Riceville | TN |
| USRHK | Rich Creek | VA |
| USRLX | Rich Hill | MO |
| USZE9 | Rich Square | NC |
| USR4N | Richardson | KY |
| USRIN | Richardson | TX |
| USRCJ | Richardton | ND |
| USRQC | Richboro | PA |
| USRXJ | Richburg | SC |
| USRTJ | Retsil | WA |
| USRT6 | Retsof | NY |
| USRUJ | Reunion | FL |
| USV8R | Reva | SD |
| USREZ | Revere | MA |
| USRE2 | Revillo | SD |
| USREX | Rex | GA |
| USRBI | Rexburg | ID |
| USRXK | Rexford | KS |
| USRXF | Rexford | MT |
| US4EX | Rexford | NY |
| USREY | Reynolds | GA |
| US4RD | Reynolds | IL |
| USRYQ | Reynolds | IN |
| USRYG | Reynoldsburg | OH |
| USYRY | Reynoldsville | PA |
| USJRA | Rheems | PA |
| USRHE | Rhine | GA |
| USZBK | Rhinebeck | NY |
| USRHI | Rhinelander | WI |
| USRNO | Reno | NV |
| USRO4 | Reno | OH |
| USRNA | Reno | PA |
| USRNQ | Reno | TX |
| USRS3 | Reno-stead | NV |
| USRNZ | Rensselaer | IN |
| USRER | Rensselaer | NY |
| USRNT | Renton | WA |
| USRTZ | Rentz | GA |
| USJE7 | Renville | MN |
| USRWG | Renwick | IA |
| USRU2 | Republic | MO |
| USRPU | Republic | WA |
| USRQG | Resaca | GA |
| USRS9 | Rescue | CA |