| Harpenden to Nowy Dwor Mazowiecki | 891.57 mi (1,434.84 km) |
| Harpenden to Nowy Sacz | 929.79 mi (1,496.34 km) |
| Harpenden to Nowy Targ | 904.05 mi (1,454.92 km) |
| Harpenden to Nowy Tomysl | 699.55 mi (1,125.82 km) |
| Harpenden to Nysa | 770.32 mi (1,239.71 km) |
| Harpenden to Oborniki | 727.06 mi (1,170.09 km) |
| Harpenden to Oborniki Slaskie | 740.31 mi (1,191.42 km) |
| Harpenden to Olawa | 761.90 mi (1,226.16 km) |
| Harpenden to Olecko | 959.76 mi (1,544.58 km) |
| Harpenden to Olesnica | 762.00 mi (1,226.32 km) |
| Harpenden to Olesno | 810.36 mi (1,304.15 km) |
| Harpenden to Olkusz | 868.84 mi (1,398.26 km) |
| Harpenden to Olsztyn | 877.46 mi (1,412.14 km) |
| Harpenden to Opalenica | 711.40 mi (1,144.89 km) |
| Harpenden to Opoczno | 883.39 mi (1,421.68 km) |
