| Harpenden to Mancha Real | 982.28 mi (1,580.83 km) |
| Harpenden to Manilva | 1,093.10 mi (1,759.18 km) |
| Harpenden to Manises | 852.22 mi (1,371.52 km) |
| Harpenden to Manlleu | 689.52 mi (1,109.67 km) |
| Harpenden to Manresa | 704.74 mi (1,134.17 km) |
| Harpenden to Manzanares | 897.68 mi (1,444.68 km) |
| Harpenden to Manzanares el Real | 784.13 mi (1,261.94 km) |
| Harpenden to Maracena | 1,022.55 mi (1,645.64 km) |
| Harpenden to Marbella | 1,080.23 mi (1,738.46 km) |
| Harpenden to Marchena | 1,030.69 mi (1,658.74 km) |
| Harpenden to Marin | 759.21 mi (1,221.84 km) |
| Harpenden to Marratxi | 854.26 mi (1,374.79 km) |
| Harpenden to Martorell | 722.70 mi (1,163.07 km) |
| Harpenden to Martos | 989.95 mi (1,593.17 km) |
| Harpenden to Masamagrell | 846.20 mi (1,361.83 km) |
