| Sheldon to Mangualde | 865.90 mi (1,393.54 km) |
| Sheldon to Marco de Canavezes | 834.11 mi (1,342.37 km) |
| Sheldon to Marinha Grande | 941.14 mi (1,514.61 km) |
| Sheldon to Massama | 1,012.00 mi (1,628.66 km) |
| Sheldon to Matosinhos | 843.72 mi (1,357.84 km) |
| Sheldon to Mealhada | 891.50 mi (1,434.73 km) |
| Sheldon to Melgaco | 775.48 mi (1,248.02 km) |
| Sheldon to Melres | 845.99 mi (1,361.49 km) |
| Sheldon to Mira | 893.06 mi (1,437.24 km) |
| Sheldon to Miranda do Corvo | 908.18 mi (1,461.57 km) |
| Sheldon to Mirandela | 798.88 mi (1,285.68 km) |
| Sheldon to Mogadouro | 802.38 mi (1,291.30 km) |
| Sheldon to Moimenta da Beira | 838.84 mi (1,349.98 km) |
| Sheldon to Moita | 1,014.17 mi (1,632.15 km) |
| Sheldon to Moncao | 782.20 mi (1,258.83 km) |
