| Harpenden to Marasesti | 1,310.26 mi (2,108.67 km) |
| Harpenden to Marghita | 1,057.10 mi (1,701.23 km) |
| Harpenden to Marginea | 1,192.65 mi (1,919.39 km) |
| Harpenden to Matca | 1,324.10 mi (2,130.93 km) |
| Harpenden to Medgidia | 1,410.30 mi (2,269.66 km) |
| Harpenden to Media | 1,179.75 mi (1,898.62 km) |
| Harpenden to Miercurea-Ciuc | 1,234.31 mi (1,986.43 km) |
| Harpenden to Mioveni | 1,245.63 mi (2,004.64 km) |
| Harpenden to Mizil | 1,306.89 mi (2,103.23 km) |
| Harpenden to Moinesti | 1,260.87 mi (2,029.18 km) |
| Harpenden to Moisei | 1,141.89 mi (1,837.69 km) |
| Harpenden to Moldova Noua | 1,119.21 mi (1,801.20 km) |
| Harpenden to Moreni | 1,274.20 mi (2,050.63 km) |
| Harpenden to Motru | 1,169.54 mi (1,882.20 km) |
| Harpenden to Murfatlar | 1,419.28 mi (2,284.11 km) |
