| Hemel Hempstead to Mangualde | 844.57 mi (1,359.21 km) |
| Hemel Hempstead to Marco de Canavezes | 815.57 mi (1,312.53 km) |
| Hemel Hempstead to Marinha Grande | 922.80 mi (1,485.10 km) |
| Hemel Hempstead to Massama | 993.14 mi (1,598.30 km) |
| Hemel Hempstead to Matosinhos | 827.46 mi (1,331.67 km) |
| Hemel Hempstead to Mealhada | 872.51 mi (1,404.18 km) |
| Hemel Hempstead to Melgaco | 759.65 mi (1,222.53 km) |
| Hemel Hempstead to Melres | 828.23 mi (1,332.91 km) |
| Hemel Hempstead to Mira | 875.30 mi (1,408.66 km) |
| Hemel Hempstead to Miranda do Corvo | 888.18 mi (1,429.39 km) |
| Hemel Hempstead to Mirandela | 776.84 mi (1,250.20 km) |
| Hemel Hempstead to Mogadouro | 778.02 mi (1,252.10 km) |
| Hemel Hempstead to Moimenta da Beira | 817.62 mi (1,315.84 km) |
| Hemel Hempstead to Moita | 994.08 mi (1,599.81 km) |
| Hemel Hempstead to Moncao | 767.19 mi (1,234.68 km) |
