| Sulphur Springs to Mangualde | 4,676.76 mi (7,526.51 km) |
| Sulphur Springs to Marco de Canavezes | 4,641.42 mi (7,469.64 km) |
| Sulphur Springs to Marinha Grande | 4,645.77 mi (7,476.64 km) |
| Sulphur Springs to Massama | 4,658.31 mi (7,496.82 km) |
| Sulphur Springs to Matosinhos | 4,615.43 mi (7,427.82 km) |
| Sulphur Springs to Mealhada | 4,650.46 mi (7,484.19 km) |
| Sulphur Springs to Melgaco | 4,609.08 mi (7,417.59 km) |
| Sulphur Springs to Melres | 4,632.98 mi (7,456.07 km) |
| Sulphur Springs to Mira | 4,635.49 mi (7,460.09 km) |
| Sulphur Springs to Miranda do Corvo | 4,664.33 mi (7,506.51 km) |
| Sulphur Springs to Mirandela | 4,678.11 mi (7,528.69 km) |
| Sulphur Springs to Mogadouro | 4,704.38 mi (7,570.97 km) |
| Sulphur Springs to Moimenta da Beira | 4,672.68 mi (7,519.96 km) |
| Sulphur Springs to Moita | 4,675.67 mi (7,524.76 km) |
| Sulphur Springs to Moncao | 4,600.35 mi (7,403.55 km) |
