World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Swoope | USZS2 | United States of America (the) |
| Sydals | DKSDA | Denmark |
| Sydney | AUSYD | Australia |
| Sydney | CASYD | Canada |
| Sydney Island | KISYI | Kiribati |
| Sykkylven | NOSYK | Norway |
| Sylvan Lake | CASYL | Canada |
| Sylvania | AUSYL | Australia |
| Sylvania | USYL9 | United States of America (the) |
| Symbister | GBSYM | United Kingdom |