| Harpenden to Poggibonsi | 785.34 mi (1,263.89 km) |
| Harpenden to Poggio a Caiano | 763.97 mi (1,229.49 km) |
| Harpenden to Poggio Renatico | 728.77 mi (1,172.85 km) |
| Harpenden to Poggiomarino | 1,037.87 mi (1,670.29 km) |
| Harpenden to Poirino | 606.43 mi (975.95 km) |
| Harpenden to Policoro | 1,139.80 mi (1,834.33 km) |
| Harpenden to Polistena | 1,219.20 mi (1,962.12 km) |
| Harpenden to Pomezia | 925.74 mi (1,489.83 km) |
| Harpenden to Pomigliano d'Arco | 1,026.70 mi (1,652.31 km) |
| Harpenden to Pompei | 1,039.00 mi (1,672.11 km) |
| Harpenden to Ponsacco | 761.15 mi (1,224.95 km) |
| Harpenden to Pontassieve | 778.06 mi (1,252.16 km) |
| Harpenden to Ponte Buggianese | 752.59 mi (1,211.18 km) |
| Harpenden to Ponte San Pietro | 618.51 mi (995.39 km) |
| Harpenden to Pontecorvo | 973.54 mi (1,566.76 km) |
