World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Clawson | USZCS | United States of America (the) |
| Claxton Bay | TTCLA | Trinidad and Tobago |
| Claydon | GBCYG | United Kingdom |
| Claymont | USCLA | United States of America (the) |
| Claysburg | USQCB | United States of America (the) |
| Clayton | USCN3 | United States of America (the) |
| Clayton | USCLY | United States of America (the) |
| Clearlake Oaks | USRXO | United States of America (the) |
| Clearville | US2PA | United States of America (the) |
| Clearwater | USEWG | United States of America (the) |