| Code | Name | Region |
|---|---|---|
| USROE | Rockdale | IL |
| USRCK | Rockdale | TX |
| US9RC | Rocket Center | WV |
| USRF4 | Rockfall | CT |
| USYIC | Rockfield | KY |
| USROH | Rochester | IL |
| USRCR | Rochester | IN |
| USK5Y | Rochester | KY |
| USRCS | Rochester | MA |
| USRCZ | Rochester | MI |
| USRST | Rochester | MN |
| USROR | Rochester | NH |
| USROC | Rochester | NY |
| USRHR | Rochester | PA |
| USRXT | Rochester | TX |
| US9RH | Rochester | VT |
| USRCW | Rochester | WA |
| USOHX | Rochester | WI |
| USRHH | Rochester Hills/detroit | MI |
| USK9C | Rock | WV |
| USRC8 | Rock City | IL |
| USOYA | Rock City Falls | NY |
| USRC6 | Rock Creek | OH |
| USRP7 | Rock Enon Springs | VA |
| USRFI | Rock Falls | IL |
| USRRO | Robersonville | NC |
| USOBA | Roberta | GA |
| USR2O | Roberts | IL |
| USRBT | Roberts | WI |
| USOBS | Robertsdale | AL |
| USRVB | Robertsville | NJ |
| USRBE | Robesonia | PA |
| USOBF | Robins Air Force Base | GA |
| USROB | Robinson | IL |
| USNSO | Robinsonville | MS |
| USZFB | Robinsville | NJ |
| USRT8 | Robstown | TX |
| USRB4 | Roby | MO |
| USRO5 | Roca | NE |
| USZRO | Rochdale | MA |
| USRCE | Roche Harbor | WA |
| USRCL | Rochelle | GA |
| USRCX | Rochelle | IL |
| USR55 | Rochelle | VA |
| USR8O | Rochelle Park | NJ |
| USR9O | Roach | MO |
| USR2M | Roan Mountain | TN |
| USRO8 | Roann | IN |
| USRN2 | Roanoke | AL |
| USRQX | Roanoke | IL |