| Idrija to Mangualde | 1,152.94 mi (1,855.49 km) |
| Idrija to Marco de Canavezes | 1,154.32 mi (1,857.70 km) |
| Idrija to Marinha Grande | 1,234.90 mi (1,987.39 km) |
| Idrija to Massama | 1,284.37 mi (2,066.99 km) |
| Idrija to Matosinhos | 1,180.43 mi (1,899.72 km) |
| Idrija to Mealhada | 1,192.16 mi (1,918.59 km) |
| Idrija to Melgaco | 1,134.95 mi (1,826.52 km) |
| Idrija to Melres | 1,169.50 mi (1,882.12 km) |
| Idrija to Mira | 1,203.99 mi (1,937.63 km) |
| Idrija to Miranda do Corvo | 1,195.52 mi (1,924.00 km) |
| Idrija to Mirandela | 1,099.94 mi (1,770.18 km) |
| Idrija to Mogadouro | 1,082.19 mi (1,741.61 km) |
| Idrija to Moimenta da Beira | 1,134.78 mi (1,826.26 km) |
| Idrija to Moita | 1,274.62 mi (2,051.30 km) |
| Idrija to Moncao | 1,146.22 mi (1,844.67 km) |
