| Harpenden to Pemberton | 153.46 mi (246.97 km) |
| Harpenden to Pembroke Dock | 196.61 mi (316.42 km) |
| Harpenden to Pen-y-Bont ar Ogwr | 139.90 mi (225.15 km) |
| Harpenden to Penarth | 123.78 mi (199.21 km) |
| Harpenden to Pencoed | 136.59 mi (219.83 km) |
| Harpenden to Pendlebury | 142.82 mi (229.85 km) |
| Harpenden to Penicuik | 300.58 mi (483.73 km) |
| Harpenden to Penistone | 129.53 mi (208.46 km) |
| Harpenden to Penkridge | 97.44 mi (156.82 km) |
| Harpenden to Penrith | 220.35 mi (354.63 km) |
| Harpenden to Penwortham | 165.62 mi (266.54 km) |
| Harpenden to Penzance | 254.21 mi (409.11 km) |
| Harpenden to Perivale | 19.34 mi (31.13 km) |
| Harpenden to Perry Barr | 81.93 mi (131.85 km) |
| Harpenden to Perth | 339.97 mi (547.13 km) |
