| Harpenden to Manerbio | 653.25 mi (1,051.31 km) |
| Harpenden to Manfredonia | 1,039.19 mi (1,672.41 km) |
| Harpenden to Maniago | 707.97 mi (1,139.37 km) |
| Harpenden to Mantova | 685.83 mi (1,103.73 km) |
| Harpenden to Maranello | 719.95 mi (1,158.64 km) |
| Harpenden to Marano di Napoli | 1,020.69 mi (1,642.65 km) |
| Harpenden to Marano Vicentino | 681.85 mi (1,097.33 km) |
| Harpenden to Marcianise | 1,017.13 mi (1,636.92 km) |
| Harpenden to Marcon | 719.68 mi (1,158.21 km) |
| Harpenden to Mareno di Piave | 708.64 mi (1,140.45 km) |
| Harpenden to Margherita di Savoia | 1,060.97 mi (1,707.47 km) |
| Harpenden to Mariano Comense | 605.13 mi (973.86 km) |
| Harpenden to Marigliano | 1,027.39 mi (1,653.43 km) |
| Harpenden to Marino | 925.41 mi (1,489.30 km) |
| Harpenden to Marostica | 687.66 mi (1,106.68 km) |
