| Merrillville to Mangualde | 3,987.78 mi (6,417.72 km) |
| Merrillville to Marco de Canavezes | 3,950.57 mi (6,357.83 km) |
| Merrillville to Marinha Grande | 3,962.77 mi (6,377.47 km) |
| Merrillville to Massama | 3,980.74 mi (6,406.38 km) |
| Merrillville to Matosinhos | 3,925.50 mi (6,317.48 km) |
| Merrillville to Mealhada | 3,963.67 mi (6,378.91 km) |
| Merrillville to Melgaco | 3,914.43 mi (6,299.67 km) |
| Merrillville to Melres | 3,943.06 mi (6,345.74 km) |
| Merrillville to Mira | 3,948.97 mi (6,355.25 km) |
| Merrillville to Miranda do Corvo | 3,978.62 mi (6,402.97 km) |
| Merrillville to Mirandela | 3,984.40 mi (6,412.27 km) |
| Merrillville to Mogadouro | 4,010.55 mi (6,454.36 km) |
| Merrillville to Moimenta da Beira | 3,981.82 mi (6,408.13 km) |
| Merrillville to Moita | 3,998.04 mi (6,434.23 km) |
| Merrillville to Moncao | 3,906.22 mi (6,286.45 km) |
