World Sea Ports
| Port Name | Port Code | Country Name |
|---|---|---|
| Macclesfield | GBMCL | United Kingdom |
| Macduff | GBMCD | United Kingdom |
| Maceió | BRMCZ | Brazil |
| Maceira | PTLE2 | Portugal |
| Machesney Park | USMP5 | United States of America (the) |
| Machico | PTMCH | Portugal |
| Machilipatnam | INMAC | India |
| Macin | ROMAC | Romania |
| Mackay | AUMKY | Australia |
| Mackinac Island | USMCD | United States of America (the) |