| Code | Name | Region |
|---|---|---|
| USRFP | Ridgefield Park | NJ |
| USRDE | Ridgeland | MS |
| USRGE | Ridgeland | SC |
| USRZG | Ridgeland | WI |
| USRG9 | Ridgeley | WV |
| USRM4 | Richmond | UT |
| USRIC | Richmond | VA |
| USRMH | Richmond | VT |
| USRMW | Richmond | WI |
| USRJJ | Richmond Beach | WA |
| USIAF | Richmond Dale | OH |
| USRMS | Richmond Heights | OH |
| USRJH | Richmond Highlands | WA |
| USRJK | Richmond Hill | GA |
| USRIX | Richmond Hill/queens/new York | NY |
| USRHL | Richmondville | NY |
| USRC9 | Richton | MS |
| USRPJ | Richton Park | IL |
| USR5P | Richton Park | IL |
| USZIA | Richvale | CA |
| USR8M | Richville | MI |
| USRWO | Richwood | KY |
| USZFA | Richwood | NJ |
| USRXI | Richwood | OH |
| USRXW | Richwood | WV |
| USRLC | Richland Center | WI |
| USXLG | Richland Hills | TX |
| USRCI | Richlands | NC |
| USRLV | Richlands | VA |
| USRC7 | Richlandtown | PA |
| USRCH | Richmond | CA |
| USRMN | Richmond | IL |
| USRID | Richmond | IN |
| USRM5 | Richmond | KS |
| USRHM | Richmond | KY |
| US9MH | Richmond | MA |
| USU6U | Richmond | ME |
| USRCN | Richmond | MI |
| USRMF | Richmond | MN |
| USHMC | Richmond | MO |
| USIHD | Richmond | NH |
| USZKF | Richmond | NY |
| USRCD | Richmond | OH |
| USRXD | Richmond | RI |
| USXLA | Richmond | TX |
| USRII | Richfield | ID |
| USRCM | Richfield | MN |
| USYYU | Richfield | NC |
| USREQ | Richfield | OH |
| USRF8 | Richfield | PA |