| Halstead to Mangualde | 878.98 mi (1,414.58 km) |
| Halstead to Marco de Canavezes | 851.40 mi (1,370.20 km) |
| Halstead to Marinha Grande | 958.49 mi (1,542.53 km) |
| Halstead to Massama | 1,028.43 mi (1,655.10 km) |
| Halstead to Matosinhos | 864.32 mi (1,390.99 km) |
| Halstead to Mealhada | 908.00 mi (1,461.29 km) |
| Halstead to Melgaco | 796.88 mi (1,282.45 km) |
| Halstead to Melres | 864.40 mi (1,391.12 km) |
| Halstead to Mira | 911.36 mi (1,466.69 km) |
| Halstead to Miranda do Corvo | 923.15 mi (1,485.66 km) |
| Halstead to Mirandela | 811.07 mi (1,305.30 km) |
| Halstead to Mogadouro | 811.05 mi (1,305.27 km) |
| Halstead to Moimenta da Beira | 852.16 mi (1,371.42 km) |
| Halstead to Moita | 1,028.77 mi (1,655.65 km) |
| Halstead to Moncao | 804.76 mi (1,295.14 km) |
