| Tadley to Mangualde | 806.94 mi (1,298.64 km) |
| Tadley to Marco de Canavezes | 777.40 mi (1,251.10 km) |
| Tadley to Marinha Grande | 884.65 mi (1,423.70 km) |
| Tadley to Massama | 955.10 mi (1,537.09 km) |
| Tadley to Matosinhos | 788.93 mi (1,269.65 km) |
| Tadley to Mealhada | 834.45 mi (1,342.92 km) |
| Tadley to Melgaco | 721.01 mi (1,160.36 km) |
| Tadley to Melres | 789.93 mi (1,271.28 km) |
| Tadley to Mira | 837.03 mi (1,347.07 km) |
| Tadley to Miranda do Corvo | 850.31 mi (1,368.44 km) |
| Tadley to Mirandela | 739.31 mi (1,189.80 km) |
| Tadley to Mogadouro | 740.98 mi (1,192.49 km) |
| Tadley to Moimenta da Beira | 779.95 mi (1,255.21 km) |
| Tadley to Moita | 956.27 mi (1,538.97 km) |
| Tadley to Moncao | 728.44 mi (1,172.32 km) |
