| Civitavecchia to Marco de Canavezes | 1,029.71 mi (1,657.16 km) |
| Civitavecchia to Marinha Grande | 1,091.72 mi (1,756.95 km) |
| Civitavecchia to Massama | 1,129.16 mi (1,817.21 km) |
| Civitavecchia to Matosinhos | 1,057.86 mi (1,702.46 km) |
| Civitavecchia to Mealhada | 1,056.22 mi (1,699.82 km) |
| Civitavecchia to Melgaco | 1,026.22 mi (1,651.54 km) |
| Civitavecchia to Melres | 1,043.96 mi (1,680.09 km) |
| Civitavecchia to Mira | 1,069.96 mi (1,721.94 km) |
| Civitavecchia to Miranda do Corvo | 1,054.83 mi (1,697.59 km) |
| Civitavecchia to Mirandela | 976.72 mi (1,571.88 km) |
| Civitavecchia to Mogadouro | 954.58 mi (1,536.25 km) |
| Civitavecchia to Moimenta da Beira | 1,004.80 mi (1,617.07 km) |
| Civitavecchia to Moita | 1,116.64 mi (1,797.07 km) |
| Civitavecchia to Moncao | 1,037.43 mi (1,669.59 km) |
| Civitavecchia to Montalegre | 1,004.54 mi (1,616.66 km) |
