World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Port Manec'h | FRPM6 | France |
| Port Mathurin | MUPMA | Mauritius |
| Port McNeill | CAPMA | Canada |
| Port Melbourne | AUPOR | Australia |
| Port Mellon | CAPML | Canada |
| Port Meneng | IDPMG | Indonesia |
| Port Monmouth | USPM3 | United States of America (the) |
| Port Moody/Vancouver | CAPMO | Canada |
| Port Mor, Muck | GBPMR | United Kingdom |
| Port Morant | JMPMO | Jamaica |