| Harpenden to Montigny-les-Metz | 342.07 mi (550.50 km) |
| Harpenden to Montivilliers | 158.71 mi (255.42 km) |
| Harpenden to Montlouis-sur-Loire | 310.54 mi (499.77 km) |
| Harpenden to Montlucon | 401.26 mi (645.77 km) |
| Harpenden to Montmagny | 229.60 mi (369.51 km) |
| Harpenden to Montmorency | 228.06 mi (367.03 km) |
| Harpenden to Montpellier | 599.82 mi (965.31 km) |
| Harpenden to Montreuil | 238.55 mi (383.91 km) |
| Harpenden to Montrouge | 238.49 mi (383.81 km) |
| Harpenden to Morangis | 245.51 mi (395.10 km) |
| Harpenden to Morieres-les-Avignon | 595.82 mi (958.88 km) |
| Harpenden to Morlaix | 271.49 mi (436.92 km) |
| Harpenden to Morsang-sur-Orge | 248.48 mi (399.88 km) |
| Harpenden to Mouans-Sartoux | 660.09 mi (1,062.30 km) |
| Harpenden to Mougins | 661.84 mi (1,065.13 km) |
