| Code | Name | Region |
|---|---|---|
| USRHY | Red Hill | PA |
| USREW | Red Hook | NY |
| USDHP | Red House | WV |
| USJDL | Red Lake Falls | MN |
| USRYD | Raymondville | MO |
| USRMV | Raymondville | TX |
| USRAM | Raymore | MO |
| USRYL | Rayne | LA |
| USXLF | Raynham | MA |
| USYRO | Raytown | MO |
| USRVY | Rayville | LA |
| USZJL | Raywood | TX |
| US8RF | Readfield | ME |
| USRDI | Reading | MA |
| USRGW | Reading | MI |
| USRDJ | Reading | OH |
| USRDG | Reading | PA |
| US7RD | Reading | VT |
| US2RG | Readington | NJ |
| US7RB | Readsboro | VT |
| USRD5 | Readstown | WI |
| USREA | Readville | MA |
| USYGA | Reagan | TX |
| USREK | Reamstown | PA |
| USRV8 | Ravensdale | WA |
| USRWW | Ravenswood | WV |
| USRAQ | Ravenwood | MO |
| US8UP | Rawlings | VA |
| USRWL | Rawlins | WY |
| USM59 | Ray | MI |
| USRY6 | Ray | ND |
| USRJX | Ray | OH |
| USYDT | Ray City | GA |
| USR3Y | Rayle | GA |
| USAYM | Raymond | CA |
| USR4Y | Raymond | GA |
| USYOD | Raymond | ME |
| USRMB | Raymond | MN |
| USUYG | Raymond | MS |
| USRND | Raymond | MT |
| USRYO | Raymond | NH |
| USRM3 | Raymond | OH |
| USACC | Raymond | WA |
| USRM2 | Raymond | WI |
| USRAS | Ranson | WV |
| USRNL | Rantoul | IL |
| USRTU | Rantoul | KS |
| USIYI | Rapid City | MI |
| USRAP | Rapid City | SD |
| USYRP | Rapidan | VA |