| Harpenden to Montana | 1,234.54 mi (1,986.80 km) |
| Harpenden to Nova Zagora | 1,385.70 mi (2,230.06 km) |
| Harpenden to Novi Iskar | 1,264.98 mi (2,035.79 km) |
| Harpenden to Novi Pazar | 1,399.97 mi (2,253.03 km) |
| Harpenden to Omurtag | 1,377.45 mi (2,216.79 km) |
| Harpenden to Panagyurishte | 1,311.15 mi (2,110.09 km) |
| Harpenden to Parvomay | 1,369.78 mi (2,204.44 km) |
| Harpenden to Pavlikeni | 1,326.73 mi (2,135.17 km) |
| Harpenden to Pazardzhik | 1,329.98 mi (2,140.39 km) |
| Harpenden to Pernik | 1,260.84 mi (2,029.12 km) |
| Harpenden to Peshtera | 1,335.84 mi (2,149.82 km) |
| Harpenden to Petrich | 1,320.90 mi (2,125.78 km) |
| Harpenden to Pleven | 1,291.41 mi (2,078.32 km) |
| Harpenden to Plovdiv | 1,348.85 mi (2,170.76 km) |
| Harpenden to Pomorie | 1,448.26 mi (2,330.76 km) |
