| Griffith to Mangualde | 3,990.77 mi (6,422.52 km) |
| Griffith to Marco de Canavezes | 3,953.51 mi (6,362.57 km) |
| Griffith to Marinha Grande | 3,965.90 mi (6,382.51 km) |
| Griffith to Massama | 3,983.98 mi (6,411.60 km) |
| Griffith to Matosinhos | 3,928.46 mi (6,322.25 km) |
| Griffith to Mealhada | 3,966.71 mi (6,383.81 km) |
| Griffith to Melgaco | 3,917.28 mi (6,304.25 km) |
| Griffith to Melres | 3,946.03 mi (6,350.52 km) |
| Griffith to Mira | 3,952.02 mi (6,360.16 km) |
| Griffith to Miranda do Corvo | 3,981.68 mi (6,407.90 km) |
| Griffith to Mirandela | 3,987.27 mi (6,416.88 km) |
| Griffith to Mogadouro | 4,013.42 mi (6,458.97 km) |
| Griffith to Moimenta da Beira | 3,984.76 mi (6,412.86 km) |
| Griffith to Moita | 4,001.29 mi (6,439.45 km) |
| Griffith to Moncao | 3,909.08 mi (6,291.05 km) |
