| Harpenden to Lubbeek | 233.21 mi (375.32 km) |
| Harpenden to Lummen | 246.11 mi (396.08 km) |
| Harpenden to Maaseik | 268.74 mi (432.49 km) |
| Harpenden to Machelen | 215.85 mi (347.38 km) |
| Harpenden to Maldegem | 168.27 mi (270.81 km) |
| Harpenden to Malmedy | 292.59 mi (470.87 km) |
| Harpenden to Manage | 218.52 mi (351.67 km) |
| Harpenden to Marche-en-Famenne | 270.66 mi (435.58 km) |
| Harpenden to Mariakerke | 180.92 mi (291.17 km) |
| Harpenden to Mechelen | 215.21 mi (346.35 km) |
| Harpenden to Mechelen-aan-de-Maas | 266.97 mi (429.64 km) |
| Harpenden to Meerhout | 238.59 mi (383.98 km) |
| Harpenden to Meise | 211.08 mi (339.70 km) |
| Harpenden to Melle | 187.63 mi (301.96 km) |
| Harpenden to Melsele | 203.41 mi (327.36 km) |
