World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Okada | JPOAA | Japan |
| Okamoto | JPOKM | Japan |
| Okamura | JPOMR | Japan |
| Okarche | USZHE | United States of America (the) |
| Okawa, Nagasaki | JPOOW | Japan |
| Okawa, Wakayama | JPOKW | Japan |
| Okayama | JPOKJ | Japan |
| Okegem | BEOKG | Belgium |
| Okemos | USOKX | United States of America (the) |
| Okgye/Gangneung | KROKK | Korea, Republic of |