| Potomac to Pontedera | 4,344.25 mi (6,991.39 km) |
| Potomac to Pontinia | 4,528.87 mi (7,288.50 km) |
| Potomac to Porcari | 4,337.49 mi (6,980.52 km) |
| Potomac to Porcia | 4,351.24 mi (7,002.64 km) |
| Potomac to Pordenone | 4,353.20 mi (7,005.79 km) |
| Potomac to Portici | 4,607.67 mi (7,415.32 km) |
| Potomac to Porto Empedocle | 4,702.45 mi (7,567.87 km) |
| Potomac to Porto Recanati | 4,483.60 mi (7,215.65 km) |
| Potomac to Porto Sant'Elpidio | 4,493.15 mi (7,231.03 km) |
| Potomac to Porto Tolle | 4,373.09 mi (7,037.80 km) |
| Potomac to Porto Torres | 4,340.45 mi (6,985.28 km) |
| Potomac to Portoferraio | 4,359.04 mi (7,015.20 km) |
| Potomac to Portogruaro | 4,366.53 mi (7,027.25 km) |
| Potomac to Portomaggiore | 4,359.55 mi (7,016.01 km) |
| Potomac to Potenza | 4,678.94 mi (7,530.03 km) |
