World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Orobay | PGROR | Papua New Guinea |
| Oron | NGORO | Nigeria |
| Orondo | USYDO | United States of America (the) |
| Oropos | GRORO | Greece |
| Oroquieta | PHORL | Philippines (the) |
| Oroso | ESOSR | Spain |
| Orotina | CRORO | Costa Rica |
| Orø | DKORO | Denmark |
| Orroir | BEORR | Belgium |
| Orsova | ROORV | Romania |