| Portici to Marco de Canavezes | 1,169.78 mi (1,882.57 km) |
| Portici to Marinha Grande | 1,225.34 mi (1,972.00 km) |
| Portici to Massama | 1,258.05 mi (2,024.63 km) |
| Portici to Matosinhos | 1,198.20 mi (1,928.32 km) |
| Portici to Mealhada | 1,192.61 mi (1,919.32 km) |
| Portici to Melgaco | 1,170.47 mi (1,883.70 km) |
| Portici to Melres | 1,183.61 mi (1,904.84 km) |
| Portici to Mira | 1,206.81 mi (1,942.17 km) |
| Portici to Miranda do Corvo | 1,189.71 mi (1,914.66 km) |
| Portici to Mirandela | 1,117.77 mi (1,798.87 km) |
| Portici to Mogadouro | 1,094.67 mi (1,761.70 km) |
| Portici to Moimenta da Beira | 1,143.60 mi (1,840.44 km) |
| Portici to Moita | 1,244.61 mi (2,003.01 km) |
| Portici to Moncao | 1,181.57 mi (1,901.55 km) |
| Portici to Montalegre | 1,147.39 mi (1,846.54 km) |
