| Code | Name | Region |
|---|---|---|
| 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 |
| USRIF | Richfield | UT |
| USQPC | Richfield | WI |
| USD5F | Richfield Springs | NY |
| USRFR | Richford | VT |
| USRG2 | Richgrove | CA |
| USR4L | Richland | GA |
| USRH7 | Richland | IA |
| USRIQ | Richland | MI |
| USRRM | Richland | MO |
| USRJL | Richland | MS |
| USQCL | Richland | NY |
| USYGT | Richland | OH |
| USIHL | Richland | OR |
| USRZK | Richland | PA |
| USRLD | Richland | WA |
| USRHO | Rhode Island | NY |
| USRH3 | Rhodesdale | MD |
| USODP | Rhodhiss | NC |
| USRBM | Rhome | TX |
| USRLO | Rialto | CA |