| Port Huron to Mangualde | 3,717.81 mi (5,983.23 km) |
| Port Huron to Marco de Canavezes | 3,680.74 mi (5,923.58 km) |
| Port Huron to Marinha Grande | 3,692.44 mi (5,942.41 km) |
| Port Huron to Massama | 3,710.23 mi (5,971.04 km) |
| Port Huron to Matosinhos | 3,655.59 mi (5,883.10 km) |
| Port Huron to Mealhada | 3,693.54 mi (5,944.18 km) |
| Port Huron to Melgaco | 3,644.97 mi (5,866.01 km) |
| Port Huron to Melres | 3,673.15 mi (5,911.37 km) |
| Port Huron to Mira | 3,678.82 mi (5,920.49 km) |
| Port Huron to Miranda do Corvo | 3,708.42 mi (5,968.13 km) |
| Port Huron to Mirandela | 3,714.85 mi (5,978.47 km) |
| Port Huron to Mogadouro | 3,741.02 mi (6,020.60 km) |
| Port Huron to Moimenta da Beira | 3,712.00 mi (5,973.89 km) |
| Port Huron to Moita | 3,727.54 mi (5,998.89 km) |
| Port Huron to Moncao | 3,636.70 mi (5,852.70 km) |
