World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Clifford | CALLF | Canada |
| Clifford Township | US2TO | United States of America (the) |
| Clifton | USIFT | United States of America (the) |
| Clifton Point | BSCLP | Bahamas |
| Climax | USJMX | United States of America (the) |
| Clinchfield | USZQC | United States of America (the) |
| Clinton | USC4N | United States of America (the) |
| Clinton | USCBT | United States of America (the) |
| Clinton | USCWZ | United States of America (the) |
| Cloghan Point/Carrickfergus | GBCGP | United Kingdom |