| Code | Name | Region |
|---|---|---|
| USRI7 | Riverside | PA |
| USVSE | Riverside | RI |
| USRN7 | Riverton | IL |
| USRJE | Riverton | KS |
| USRV6 | Riverton | MN |
| USRVJ | Riverton | NJ |
| USYIV | Riverton | UT |
| USRIW | Riverton | WY |
| USRRW | Riverview | FL |
| USRVW | Riverview | MI |
| USRL9 | Riverville | VA |
| USVWD | Riverwoods | IL |
| USIEJ | Rives Junction | MI |
| USRBC | Riviera Beach | FL |
| USVYX | Rixeyville | VA |
| USQQN | River Ridge | LA |
| USRRJ | River Rouge | MI |
| USRR8 | Rivera Beach | FL |
| USZRB | Riverbank | CA |
| USRVX | Riverdale | CA |
| USRQV | Riverdale | GA |
| USIVU | Riverdale | IA |
| USRRD | Riverdale | IL |
| USRVL | Riverdale | MD |
| USRXE | Riverdale | MI |
| USRDL | Riverdale | NJ |
| USRV5 | Riverdale | NY |
| USRD9 | Riverdale | UT |
| USRGJ | Rivergate | OR |
| USRHD | Riverhead | NY |
| US2RV | Riverside | AL |
| USRAL | Riverside | CA |
| USVRD | Riverside | CT |
| USVSD | Riverside | IA |
| USIVD | Riverside | IL |
| USRPL | Ripley | TN |
| USRPE | Ripley | WV |
| USRIP | Ripon | CA |
| USRPN | Ripon | WI |
| USRP4 | Ripplemead | VA |
| US7RI | Ripton | VT |
| USRIH | Ririe | ID |
| USR9C | Rising City | NE |
| USIWK | Rising Fawn | GA |
| USRUN | Rising Sun | MD |
| USRTN | Rittman | OH |
| USRZV | Ritzville | WA |
| USR6V | Riva | MD |
| USRQQ | River Edge | NJ |
| USRFL | River Falls | AL |