| Mastic Beach to Mangualde | 3,326.22 mi (5,353.03 km) |
| Mastic Beach to Marco de Canavezes | 3,292.17 mi (5,298.24 km) |
| Mastic Beach to Marinha Grande | 3,292.15 mi (5,298.21 km) |
| Mastic Beach to Massama | 3,302.61 mi (5,315.04 km) |
| Mastic Beach to Matosinhos | 3,265.66 mi (5,255.56 km) |
| Mastic Beach to Mealhada | 3,298.72 mi (5,308.77 km) |
| Mastic Beach to Melgaco | 3,262.74 mi (5,250.87 km) |
| Mastic Beach to Melres | 3,283.15 mi (5,283.72 km) |
| Mastic Beach to Mira | 3,283.63 mi (5,284.49 km) |
| Mastic Beach to Miranda do Corvo | 3,311.98 mi (5,330.12 km) |
| Mastic Beach to Mirandela | 3,330.81 mi (5,360.42 km) |
| Mastic Beach to Mogadouro | 3,357.09 mi (5,402.72 km) |
| Mastic Beach to Moimenta da Beira | 3,323.36 mi (5,348.43 km) |
| Mastic Beach to Moita | 3,319.97 mi (5,342.97 km) |
| Mastic Beach to Moncao | 3,253.63 mi (5,236.21 km) |
