| Harpenden to Miranda de Ebro | 642.51 mi (1,034.01 km) |
| Harpenden to Mislata | 852.79 mi (1,372.43 km) |
| Harpenden to Moana | 767.12 mi (1,234.57 km) |
| Harpenden to Moguer | 1,053.31 mi (1,695.13 km) |
| Harpenden to Molina de Segura | 951.82 mi (1,531.81 km) |
| Harpenden to Molins de Rey | 727.45 mi (1,170.71 km) |
| Harpenden to Mollerusa | 706.22 mi (1,136.55 km) |
| Harpenden to Mollet | 720.61 mi (1,159.70 km) |
| Harpenden to Moncada | 723.77 mi (1,164.79 km) |
| Harpenden to Moncada | 847.91 mi (1,364.58 km) |
| Harpenden to Monforte de Lemos | 724.59 mi (1,166.12 km) |
| Harpenden to Monforte del Cid | 928.68 mi (1,494.56 km) |
| Harpenden to Mongat | 725.85 mi (1,168.15 km) |
| Harpenden to Monovar | 924.81 mi (1,488.33 km) |
| Harpenden to Monserrat | 860.99 mi (1,385.62 km) |
