| Formia to Marco de Canavezes | 1,128.19 mi (1,815.64 km) |
| Formia to Marinha Grande | 1,185.88 mi (1,908.49 km) |
| Formia to Massama | 1,220.13 mi (1,963.61 km) |
| Formia to Matosinhos | 1,156.54 mi (1,861.27 km) |
| Formia to Mealhada | 1,152.24 mi (1,854.34 km) |
| Formia to Melgaco | 1,127.50 mi (1,814.53 km) |
| Formia to Melres | 1,142.17 mi (1,838.14 km) |
| Formia to Mira | 1,166.29 mi (1,876.97 km) |
| Formia to Miranda do Corvo | 1,149.83 mi (1,850.47 km) |
| Formia to Mirandela | 1,075.83 mi (1,731.38 km) |
| Formia to Mogadouro | 1,053.03 mi (1,694.69 km) |
| Formia to Moimenta da Beira | 1,102.41 mi (1,774.16 km) |
| Formia to Moita | 1,206.98 mi (1,942.45 km) |
| Formia to Moncao | 1,138.63 mi (1,832.46 km) |
| Formia to Montalegre | 1,104.87 mi (1,778.12 km) |
