| Abbreviation | Definition |
|---|---|
| ROM | Rome, Italy |
| ROMD | Minami Daito Jima, Japan |
| ROMY | Miyako, Japan |
| RON | Rondon, Colombia |
| ROO | Rondonopolis, MT, Brazil |
| ROP | Rota, Mariana Islands |
| ROR | Koro, Palau Islands |
| RORA | Aguni, Japan |
| RORH | Hateruma, Japan |
| RORK | Kita-Daito, Japan |
| RORS | Shimojishima, Japan |
| RORT | Tarama, Japan |
| RORY | Yoron Jima, Japan |
| ROS | Rosario, Santa Fe, Argentina |
| ROT | Rotorua, New Zealand |
| ROTM | Futema, Japan |
| ROU | Rousse, Bulgaria |
| ROV | Rostov, Russia |
| ROW | Roswell, New Mexico USA |
| ROY | Rio Mayo, CB, Argentina |