| Code | Name | Region |
|---|---|---|
| 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 |
| USRES | Rescue | VA |
| USYTP | Research Triangle Park | NC |
| USRSE | Reseda | CA |
| USRSF | Reserve | LA |
| USRTV | Reston | VA |
| USRP2 | Rego Park, Queens | NY |
| USRZX | Rehoboth | MA |
| USREH | Rehoboth Beach | DE |
| USR5B | Rehrersburg | PA |
| USREE | Reidsville | GA |
| USRIV | Reidsville | NC |
| USRV2 | Reidville | SC |
| USRB2 | Reinbeck | IA |
| USR9H | Reinholds | PA |
| USRSW | Reisterstown | MD |
| USRK9 | Reklaw | TX |
| USRLW | Relay | MD |
| USIAC | Reliance | WY |
| USRJR | Rembrandt | IA |
| USRXG | Remington | IN |
| USXLJ | Remington | VA |
| USRS8 | Remsen | IA |
| USRUQ | Remus | MI |
| USXZQ | Renfrew | PA |
| USIZK | Renick | WV |
| USRD6 | Reed | KY |
| USRCT | Reed City | MI |
| USRD2 | Reeder | ND |
| USRDC | Reedley | CA |
| USRZE | Reeds | MO |