| Galveston to Mangualde | 4,797.96 mi (7,721.57 km) |
| Galveston to Marco de Canavezes | 4,764.53 mi (7,667.77 km) |
| Galveston to Marinha Grande | 4,761.73 mi (7,663.27 km) |
| Galveston to Massama | 4,769.54 mi (7,675.83 km) |
| Galveston to Matosinhos | 4,737.81 mi (7,624.77 km) |
| Galveston to Mealhada | 4,769.79 mi (7,676.23 km) |
| Galveston to Melgaco | 4,735.96 mi (7,621.79 km) |
| Galveston to Melres | 4,755.27 mi (7,652.86 km) |
| Galveston to Mira | 4,754.64 mi (7,651.85 km) |
| Galveston to Miranda do Corvo | 4,782.61 mi (7,696.87 km) |
| Galveston to Mirandela | 4,803.78 mi (7,730.94 km) |
| Galveston to Mogadouro | 4,830.05 mi (7,773.22 km) |
| Galveston to Moimenta da Beira | 4,795.66 mi (7,717.87 km) |
| Galveston to Moita | 4,786.86 mi (7,703.71 km) |
| Galveston to Moncao | 4,726.77 mi (7,607.01 km) |
