| Code | Name | Region |
|---|---|---|
| USR33 | Riley | MI |
| USRI9 | Rillito | AZ |
| USRIM | Rimer | OH |
| USRB3 | Rimersburg | PA |
| USRIK | Rincon | GA |
| USNJN | Rincon | NM |
| US9RI | Rindge | NH |
| USR2R | Riner | VA |
| USRGD | Ringgold | GA |
| USRJO | Ringgold | PA |
| USRXV | Ringgold | VA |
| USRAF | Ringle | WI |
| USYGO | Ringoes | NJ |
| USR3G | Ringold | OK |
| USGSD | Ringsted | IA |
| USRGZ | Ridgely | MD |
| USRVQ | Ridgeville | IN |
| USRIS | Ridgeville | SC |
| USDLC | Ridgeville Corners | OH |
| USXRY | Ridgeway | CO |
| USXVX | Ridgeway | NC |
| USZRW | Ridgeway | SC |
| USRIT | Ridgeway | WI |
| USRJV | Ridgeway, Henry | VA |
| USRWD | Ridgewood | NJ |
| USRGO | Ridgewood | NY |
| US5RW | Ridgway | CO |
| USRJW | Ridgway | IL |
| USXLE | Ridgway | PA |
| USRPK | Ridley Park | PA |
| USRZT | Ridott | IL |
| USRGL | Riegelwood | NC |
| USRZI | Rienzi | MS |
| USRIZ | Riesel | TX |
| USRIL | Rifle | CO |
| USRW3 | Richwoods | MO |
| USRIB | Rickenbacker International Apt | OH |
| USKU8 | Rickman | TN |
| USZIC | Rickreall | OR |
| USR2C | Rico | CO |
| USRIR | Riddle | OR |
| USRB6 | Riddlesburg | PA |
| USR5D | Ridge | NY |
| USGPJ | Ridge Spring | SC |
| USIGD | Ridgecrest | CA |
| USRT9 | Ridgecrest | NC |
| USRG8 | Ridgedale | MO |
| USRF3 | Ridgefield | CT |
| USUYE | Ridgefield | NJ |
| USRLF | Ridgefield | WA |