| Great Falls to Mangualde | 4,761.41 mi (7,662.75 km) |
| Great Falls to Marco de Canavezes | 4,718.73 mi (7,594.07 km) |
| Great Falls to Marinha Grande | 4,759.56 mi (7,659.77 km) |
| Great Falls to Massama | 4,795.21 mi (7,717.14 km) |
| Great Falls to Matosinhos | 4,698.44 mi (7,561.41 km) |
| Great Falls to Mealhada | 4,746.69 mi (7,639.06 km) |
| Great Falls to Melgaco | 4,669.04 mi (7,514.09 km) |
| Great Falls to Melres | 4,715.20 mi (7,588.38 km) |
| Great Falls to Mira | 4,733.70 mi (7,618.16 km) |
| Great Falls to Miranda do Corvo | 4,764.90 mi (7,668.36 km) |
| Great Falls to Mirandela | 4,739.41 mi (7,627.35 km) |
| Great Falls to Mogadouro | 4,763.81 mi (7,666.61 km) |
| Great Falls to Moimenta da Beira | 4,748.42 mi (7,641.84 km) |
| Great Falls to Moita | 4,811.52 mi (7,743.39 km) |
| Great Falls to Moncao | 4,663.35 mi (7,504.94 km) |
