| Irmo to Mangualde | 3,940.68 mi (6,341.91 km) |
| Irmo to Marco de Canavezes | 3,908.64 mi (6,290.36 km) |
| Irmo to Marinha Grande | 3,901.25 mi (6,278.46 km) |
| Irmo to Massama | 3,906.46 mi (6,286.83 km) |
| Irmo to Matosinhos | 3,881.48 mi (6,246.64 km) |
| Irmo to Mealhada | 3,911.34 mi (6,294.70 km) |
| Irmo to Melgaco | 3,882.94 mi (6,248.99 km) |
| Irmo to Melres | 3,898.83 mi (6,274.56 km) |
| Irmo to Mira | 3,896.11 mi (6,270.19 km) |
| Irmo to Miranda do Corvo | 3,923.49 mi (6,314.24 km) |
| Irmo to Mirandela | 3,949.65 mi (6,356.35 km) |
| Irmo to Mogadouro | 3,975.85 mi (6,398.51 km) |
| Irmo to Moimenta da Beira | 3,939.61 mi (6,340.18 km) |
| Irmo to Moita | 3,923.73 mi (6,314.64 km) |
| Irmo to Moncao | 3,873.43 mi (6,233.69 km) |
