| Witney to Mangualde | 827.62 mi (1,331.92 km) |
| Witney to Marco de Canavezes | 796.97 mi (1,282.60 km) |
| Witney to Marinha Grande | 904.17 mi (1,455.12 km) |
| Witney to Massama | 974.86 mi (1,568.88 km) |
| Witney to Matosinhos | 807.58 mi (1,299.68 km) |
| Witney to Mealhada | 854.22 mi (1,374.73 km) |
| Witney to Melgaco | 739.47 mi (1,190.06 km) |
| Witney to Melres | 809.20 mi (1,302.28 km) |
| Witney to Mira | 856.31 mi (1,378.10 km) |
| Witney to Miranda do Corvo | 870.48 mi (1,400.90 km) |
| Witney to Mirandela | 760.25 mi (1,223.50 km) |
| Witney to Mogadouro | 762.82 mi (1,227.64 km) |
| Witney to Moimenta da Beira | 800.58 mi (1,288.40 km) |
| Witney to Moita | 976.51 mi (1,571.53 km) |
| Witney to Moncao | 746.56 mi (1,201.48 km) |
