| Boston to Mangualde | 928.50 mi (1,494.28 km) |
| Boston to Marco de Canavezes | 898.61 mi (1,446.18 km) |
| Boston to Marinha Grande | 1,005.86 mi (1,618.77 km) |
| Boston to Massama | 1,076.41 mi (1,732.31 km) |
| Boston to Matosinhos | 909.73 mi (1,464.07 km) |
| Boston to Mealhada | 955.75 mi (1,538.13 km) |
| Boston to Melgaco | 841.70 mi (1,354.58 km) |
| Boston to Melres | 911.02 mi (1,466.15 km) |
| Boston to Mira | 958.13 mi (1,541.97 km) |
| Boston to Miranda do Corvo | 971.74 mi (1,563.87 km) |
| Boston to Mirandela | 860.92 mi (1,385.52 km) |
| Boston to Mogadouro | 862.71 mi (1,388.39 km) |
| Boston to Moimenta da Beira | 901.50 mi (1,450.82 km) |
| Boston to Moita | 1,077.73 mi (1,734.44 km) |
| Boston to Moncao | 848.94 mi (1,366.24 km) |
