| Harpenden to Massarosa | 738.32 mi (1,188.20 km) |
| Harpenden to Matelica | 856.78 mi (1,378.86 km) |
| Harpenden to Matera | 1,112.86 mi (1,790.97 km) |
| Harpenden to Matino | 1,198.75 mi (1,929.21 km) |
| Harpenden to Mazzarino | 1,227.71 mi (1,975.81 km) |
| Harpenden to Meda | 606.30 mi (975.74 km) |
| Harpenden to Medesano | 684.92 mi (1,102.27 km) |
| Harpenden to Medicina | 747.97 mi (1,203.75 km) |
| Harpenden to Meldola | 779.71 mi (1,254.82 km) |
| Harpenden to Melegnano | 627.25 mi (1,009.46 km) |
| Harpenden to Melendugno | 1,193.66 mi (1,921.01 km) |
| Harpenden to Melfi | 1,063.20 mi (1,711.05 km) |
| Harpenden to Melilli | 1,260.72 mi (2,028.93 km) |
| Harpenden to Melito di Napoli | 1,021.37 mi (1,643.73 km) |
| Harpenden to Melito di Porto Salvo | 1,237.96 mi (1,992.31 km) |
