| Harpenden to Marsala | 1,150.02 mi (1,850.78 km) |
| Harpenden to Marsciano | 852.42 mi (1,371.84 km) |
| Harpenden to Martano | 1,195.93 mi (1,924.66 km) |
| Harpenden to Martellago | 714.90 mi (1,150.51 km) |
| Harpenden to Martina Franca | 1,136.35 mi (1,828.78 km) |
| Harpenden to Martinengo | 630.85 mi (1,015.26 km) |
| Harpenden to Martinsicuro | 906.57 mi (1,458.98 km) |
| Harpenden to Mascali | 1,230.06 mi (1,979.60 km) |
| Harpenden to Mascalucia | 1,236.32 mi (1,989.67 km) |
| Harpenden to Masera di Padova | 715.25 mi (1,151.08 km) |
| Harpenden to Maserada sul Piave | 711.42 mi (1,144.92 km) |
| Harpenden to Massa | 723.12 mi (1,163.74 km) |
| Harpenden to Massa Lombarda | 755.84 mi (1,216.41 km) |
| Harpenden to Massafra | 1,134.92 mi (1,826.47 km) |
| Harpenden to Massalubrense | 1,041.55 mi (1,676.22 km) |
