| Potomac to Perth | 3,445.48 mi (5,544.97 km) |
| Potomac to Peterborough | 3,638.92 mi (5,856.28 km) |
| Potomac to Peterhead | 3,489.06 mi (5,615.11 km) |
| Potomac to Peterlee | 3,552.62 mi (5,717.38 km) |
| Potomac to Petersfield | 3,644.12 mi (5,864.65 km) |
| Potomac to Pinner | 3,653.67 mi (5,880.02 km) |
| Potomac to Pitsea | 3,690.54 mi (5,939.35 km) |
| Potomac to Plumstead | 3,675.47 mi (5,915.10 km) |
| Potomac to Plymouth | 3,523.83 mi (5,671.05 km) |
| Potomac to Plympton | 3,527.38 mi (5,676.76 km) |
| Potomac to Plymstock | 3,526.32 mi (5,675.07 km) |
| Potomac to Polegate | 3,696.89 mi (5,949.58 km) |
| Potomac to Ponders End | 3,666.48 mi (5,900.64 km) |
| Potomac to Pont-y-pwl | 3,543.00 mi (5,701.91 km) |
| Potomac to Pontardulais | 3,501.82 mi (5,635.63 km) |
