World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Óbidos | BROBI | Brazil |
| Obion | USOBI | United States of America (the) |
| Obonjan | HRONJ | Croatia |
| Obourg | BEOBR | Belgium |
| Obregón | MXOBR | Mexico |
| Ocean Cay | BSOCE | Bahamas |
| Ocean Falls | CAOFA | Canada |
| Ocean Gate | USOAM | United States of America (the) |
| Ocean View | USOCX | United States of America (the) |
| Oceanport | USOCP | United States of America (the) |