| Harpenden to Mechernich | 314.42 mi (506.01 km) |
| Harpenden to Meckenbeuren | 525.42 mi (845.58 km) |
| Harpenden to Meckenheim | 329.03 mi (529.53 km) |
| Harpenden to Meerane | 556.51 mi (895.61 km) |
| Harpenden to Meerbusch | 303.89 mi (489.07 km) |
| Harpenden to Meine | 463.23 mi (745.49 km) |
| Harpenden to Meinerzhagen | 346.94 mi (558.34 km) |
| Harpenden to Meiningen | 474.09 mi (762.98 km) |
| Harpenden to Meissen | 595.99 mi (959.16 km) |
| Harpenden to Meitingen | 543.75 mi (875.09 km) |
| Harpenden to Melle | 370.36 mi (596.04 km) |
| Harpenden to Melsungen | 428.42 mi (689.48 km) |
| Harpenden to Memmelsdorf | 509.24 mi (819.54 km) |
| Harpenden to Memmingen | 537.56 mi (865.11 km) |
| Harpenden to Mendig | 345.71 mi (556.37 km) |
