World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Castillazuelo | ESHHU | Spain |
| Castle Hills | USC4H | United States of America (the) |
| Castle Island | USXSD | United States of America (the) |
| Castlebay | GBCBA | United Kingdom |
| Castlefinn | IECFI | Ireland |
| Castleford | GBCTF | United Kingdom |
| Castlenock | IETLK | Ireland |
| Castletown | IMCTN | Isle of Man |
| Castletown | GBCSW | United Kingdom |
| Castletown Bearhaven | IECTB | Ireland |