| Marshalltown to Mangualde | 4,220.62 mi (6,792.43 km) |
| Marshalltown to Marco de Canavezes | 4,182.17 mi (6,730.55 km) |
| Marshalltown to Marinha Grande | 4,199.75 mi (6,758.85 km) |
| Marshalltown to Massama | 4,221.04 mi (6,793.11 km) |
| Marshalltown to Matosinhos | 4,157.84 mi (6,691.40 km) |
| Marshalltown to Mealhada | 4,198.12 mi (6,756.21 km) |
| Marshalltown to Melgaco | 4,143.26 mi (6,667.93 km) |
| Marshalltown to Melres | 4,175.36 mi (6,719.59 km) |
| Marshalltown to Mira | 4,183.65 mi (6,732.93 km) |
| Marshalltown to Miranda do Corvo | 4,213.75 mi (6,781.37 km) |
| Marshalltown to Mirandela | 4,213.73 mi (6,781.35 km) |
| Marshalltown to Mogadouro | 4,239.72 mi (6,823.16 km) |
| Marshalltown to Moimenta da Beira | 4,213.32 mi (6,780.68 km) |
| Marshalltown to Moita | 4,238.26 mi (6,820.82 km) |
| Marshalltown to Moncao | 4,135.47 mi (6,655.40 km) |
