World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Slikkendam | NLSKM | Netherlands |
| Slite | SESLI | Sweden |
| Slochteren | NLSLO | Netherlands |
| Slonim | BYSNM | Belarus |
| Sloten | NLSLT | Netherlands |
| Sløvåg | NOSLV | Norway |
| Sluiskil | NLSLU | Netherlands |
| Smackover | USSK4 | United States of America (the) |
| Smalkalden | SRSMA | Suriname |
| Small Heath | GBSJJ | United Kingdom |