| Code | Name | Region |
|---|---|---|
| USRS2 | Reeds Spring | MO |
| USRDS | Reedsburg | WI |
| USREL | Reedsville | PA |
| USREI | Reedsville | WI |
| USEIV | Reedsville | WV |
| USREV | Reedville | VA |
| USRYY | Reedy | WV |
| USRLZ | Reelsville | IN |
| USRMI | Reese | MI |
| USEEV | Reeseville | WI |
| USRF2 | Reform | AL |
| USRFG | Refugio | TX |
| USQRE | Regal | NC |
| USQRH | Regent | ND |
| USRGT | Register | GA |
| USDDP | Redding | IA |
| USRRG | Redding Ridge | CT |
| USR3D | Redfield | AR |
| USRFQ | Redfield | IA |
| USRDF | Redford | MI |
| USRJG | Redgranite | WI |
| USRLS | Redlands | CA |
| USRMD | Redmond | OR |
| USRMQ | Redmond | UT |
| USXLC | Redmond | WA |
| USRBD | Redondo Beach | CA |
| USN9S | Redstone | CO |
| USR3V | Redvale | CO |
| USRPD | Redwater | TX |
| USRD7 | Redway | CA |
| USDWR | Redwood | MS |
| USRWC | Redwood City | CA |
| USRWF | Redwood Falls | MN |
| USRR6 | Redwood Valley | CA |
| USRLN | Red Lion | PA |
| USRLJ | Red Lodge | MT |
| USRDK | Red Oak | IA |
| USRQK | Red Oak | TX |
| USRKM | Red Oak | VA |
| USRDR | Red River | ND |
| USR9V | Red River | NM |
| USRRV | Red River Ad | TX |
| US9RR | Red Rock | AZ |
| USR2K | Red Rock | OK |
| USEOF | Red Rock | TX |
| USRPG | Red Springs | NC |
| USVFA | Red Valley | AZ |
| USRDW | Red Wing | MN |
| USQAD | Redan | GA |
| USR4B | Redby | MN |