| Code | Name | Region |
|---|---|---|
| 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 |
| 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 |