| Muscle Shoals to Mangualde | 4,233.72 mi (6,813.51 km) |
| Muscle Shoals to Marco de Canavezes | 4,199.66 mi (6,758.69 km) |
| Muscle Shoals to Marinha Grande | 4,199.34 mi (6,758.18 km) |
| Muscle Shoals to Massama | 4,209.04 mi (6,773.80 km) |
| Muscle Shoals to Matosinhos | 4,173.16 mi (6,716.05 km) |
| Muscle Shoals to Mealhada | 4,206.17 mi (6,769.18 km) |
| Muscle Shoals to Melgaco | 4,169.96 mi (6,710.90 km) |
| Muscle Shoals to Melres | 4,190.65 mi (6,744.20 km) |
| Muscle Shoals to Mira | 4,191.07 mi (6,744.88 km) |
| Muscle Shoals to Miranda do Corvo | 4,219.37 mi (6,790.42 km) |
| Muscle Shoals to Mirandela | 4,238.15 mi (6,820.65 km) |
| Muscle Shoals to Mogadouro | 4,264.44 mi (6,862.95 km) |
| Muscle Shoals to Moimenta da Beira | 4,230.85 mi (6,808.89 km) |
| Muscle Shoals to Moita | 4,226.40 mi (6,801.73 km) |
| Muscle Shoals to Moncao | 4,160.90 mi (6,696.32 km) |
