| Boulder to Mangualde | 4,833.40 mi (7,778.61 km) |
| Boulder to Marco de Canavezes | 4,793.49 mi (7,714.38 km) |
| Boulder to Marinha Grande | 4,817.92 mi (7,753.69 km) |
| Boulder to Massama | 4,843.29 mi (7,794.52 km) |
| Boulder to Matosinhos | 4,770.23 mi (7,676.94 km) |
| Boulder to Mealhada | 4,813.06 mi (7,745.87 km) |
| Boulder to Melgaco | 4,751.10 mi (7,646.15 km) |
| Boulder to Melres | 4,787.62 mi (7,704.92 km) |
| Boulder to Mira | 4,798.94 mi (7,723.15 km) |
| Boulder to Miranda do Corvo | 4,829.52 mi (7,772.36 km) |
| Boulder to Mirandela | 4,821.94 mi (7,760.16 km) |
| Boulder to Mogadouro | 4,847.58 mi (7,801.43 km) |
| Boulder to Moimenta da Beira | 4,824.37 mi (7,764.07 km) |
| Boulder to Moita | 4,860.34 mi (7,821.97 km) |
| Boulder to Moncao | 4,743.91 mi (7,634.58 km) |
