| Code | Name | Region |
|---|---|---|
| USRDZ | Reddell | LA |
| USREB | Reddick | FL |
| USRDD | Redding | CA |
| USRGX | Redding | CT |
| USRJA | Reasnor | IA |
| USRCC | Rebecca | GA |
| US3RT | Rector | AR |
| USREN | Red Bank | NJ |
| USRKB | Red Bank | TN |
| USRDY | Red Bay | AL |
| USRBL | Red Bluff | CA |
| USRB5 | Red Bluff | TX |
| USRBP | Red Boiling Springs | TN |
| USRRB | Red Bud | IL |
| USR4C | Red Cloud | NE |
| USRKQ | Red Creek | NY |
| USRDV | Red Devil | AK |
| USRDB | Red Dog | AK |
| USRF5 | Red Feather Lakes | CO |
| USRHX | Red Hill | AR |
| 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 |