| Port Code | Port Name | Country |
| CAMOB | Morrisburg | Canada |
| CAMOL | Mont-Louis | Canada |
| CAMON | Monkton | Canada |
| CAMOP | Morell | Canada |
| CAMOR | Morden | Canada |
| CAMOS | Mount Stewart | Canada |
| CAMOU | Moosonee | Canada |
| CAMPE | Mount Pearl | Canada |
| CAMPS | Mount Pleasant | Canada |
| CAMQE | Malpeque Bay | Canada |
| CAMQT | Marquette | Canada |
| CAMRB | Mirabel | Canada |
| CAMRF | Moorefield | Canada |
| CAMRI | Maple Ridge | Canada |
| CAMRL | Mont-Royal | Canada |
| CAMRN | Montréal-Nord | Canada |
| CAMRO | Mont Rolland | Canada |
| CAMRS | Morris | Canada |
| CAMRT | St Martin | Canada |
| CAMRV | Morinville | Canada |
| CAMSA | Muskrat Dam | Canada |
| CAMSC | Mascouche | Canada |
| CAMSG | Mont-Saint-Gregoire | Canada |
| CAMSH | Mont St Hilaire | Canada |
| CAMSS | Masset | Canada |
| CAMST | Mistassini | Canada |
| CAMTC | Metcalfe | Canada |
| CAMTF | Mount Forest | Canada |
| CAMTH | Mitchell | Canada |
| CAMTN | Marystown | Canada |
| CAMTR | Montreal | Canada |
| CAMUH | Murray Harbour | Canada |
| CAMUL | Mulgrave | Canada |
| CAMUR | Murray River | Canada |
| CAMVE | Murdochville | Canada |
| CAMVL | Marieville | Canada |
| CAMWA | Madawaska | Canada |
| CAMYR | Myrtle | Canada |
| CANAC | Nackawic | Canada |
| CANAF | North Arm Fraser | Canada |
| CANAI | Nain | Canada |
| CANAN | Nanticoke | Canada |
| CANAP | Napierville | Canada |
| CANBC | Notre-Dame-du-Bon-Conseil | Canada |
| CANBF | Nobleford | Canada |
| CANBH | Newburgh | Canada |
| CANBM | New Bothwell | Canada |
| CANCT | Newcastle | Canada |
| CANDK | New Denmark | Canada |
| CANDM | Mont-Carmel | Canada |
| CANDN | Napadogan | Canada |
| CANEA | New Annan | Canada |
| CANEE | Neepawa | Canada |
| CANEP | Neptune | Canada |
| CANGL | New Glasgow | Canada |
| CANGY | New Germany | Canada |
| CANHM | New Hamburg | Canada |
| CANIA | Niagara Falls | Canada |
| CANIM | Nimpkish | Canada |
| CANIU | Nisku | Canada |
| CANLI | New Liskeard | Canada |
| CANLS | Nelson | Canada |
| CANLT | Nicolet | Canada |
| CANMA | New Minas | Canada |
| CANMI | Nelson-Miramichi | Canada |
| CANMN | Normandin | Canada |
| CANMP | Nampa | Canada |
| CANNE | Nanoose Bay | Canada |
| CANNO | Nanaimo | Canada |
| CANOJ | Saint-Nicolas | Canada |
| CANOL | Niagara-on-the-Lake | Canada |
| CANOR | North Bay | Canada |
| CANPA | Napanee | Canada |
| CANPH | Nephton | Canada |
| CANPL | Nimpo Lake | Canada |
| CANPN | Nepean | Canada |
| CANPU | Nepeau | Canada |
| CANPW | Nipawin | Canada |
| CANRC | New Richmond | Canada |
| CANRN | Noranda | Canada |
| CANRU | North Rustico | Canada |
| CANSK | Nisku/Edmonton | Canada |
| CANSY | North Sydney | Canada |
| CANVA | Norval | Canada |
| CANVK | Nanisivik | Canada |
| CANWA | New Waterford | Canada |
| CANWC | Norwich (Ontario) | Canada |
| CANWE | New Westminster | Canada |
| CANWM | Newmarket | Canada |
| CANWP | Argentia | Canada |
| CANYK | North York | Canada |
| CAOAK | Oakville | Canada |
| CAOCH | Locusthill | Canada |
| CAODS | Olds | Canada |
| CAOFA | Ocean Falls | Canada |
| CAOLE | O'Leary | Canada |
| CAOOK | Outlook | Canada |
| CAOPE | Port Hope | Canada |
| CAOPL | Old Perlican | Canada |
| CAORA | Orangeville | Canada |