World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Okha | INOKH | India |
| Okha, Sakhalin | RUOKA | Russian Federation (the) |
| Okhotsk | RUOHO | Russian Federation (the) |
| Oki | JPOKI | Japan |
| Okinajima | JPOKN | Japan |
| Okinokojima | JPOKK | Japan |
| Okitsu, Chiba | JPOKC | Japan |
| Okitsu, Shizuoka | JPOKT | Japan |
| Okiura, Hiroshima | JPOIU | Japan |
| Okiura, Yamaguchi | JPOKX | Japan |