| Rickmansworth to Mangualde | 837.61 mi (1,348.01 km) |
| Rickmansworth to Marco de Canavezes | 808.77 mi (1,301.59 km) |
| Rickmansworth to Marinha Grande | 915.99 mi (1,474.15 km) |
| Rickmansworth to Massama | 986.29 mi (1,587.28 km) |
| Rickmansworth to Matosinhos | 820.80 mi (1,320.94 km) |
| Rickmansworth to Mealhada | 865.68 mi (1,393.18 km) |
| Rickmansworth to Melgaco | 753.03 mi (1,211.88 km) |
| Rickmansworth to Melres | 821.47 mi (1,322.04 km) |
| Rickmansworth to Mira | 868.54 mi (1,397.78 km) |
| Rickmansworth to Miranda do Corvo | 881.29 mi (1,418.30 km) |
| Rickmansworth to Mirandela | 769.85 mi (1,238.96 km) |
| Rickmansworth to Mogadouro | 770.91 mi (1,240.66 km) |
| Rickmansworth to Moimenta da Beira | 810.68 mi (1,304.66 km) |
| Rickmansworth to Moita | 987.16 mi (1,588.68 km) |
| Rickmansworth to Moncao | 760.62 mi (1,224.10 km) |
