| Williamstown to Poggibonsi | 4,249.85 mi (6,839.48 km) |
| Williamstown to Poggio a Caiano | 4,234.48 mi (6,814.74 km) |
| Williamstown to Poggio Renatico | 4,220.98 mi (6,793.01 km) |
| Williamstown to Poggiomarino | 4,493.48 mi (7,231.55 km) |
| Williamstown to Poirino | 4,058.25 mi (6,531.12 km) |
| Williamstown to Policoro | 4,609.53 mi (7,418.32 km) |
| Williamstown to Polistena | 4,651.03 mi (7,485.10 km) |
| Williamstown to Pomezia | 4,371.35 mi (7,035.01 km) |
| Williamstown to Pomigliano d'Arco | 4,482.56 mi (7,213.99 km) |
| Williamstown to Pompei | 4,493.08 mi (7,230.92 km) |
| Williamstown to Ponsacco | 4,222.19 mi (6,794.96 km) |
| Williamstown to Pontassieve | 4,252.05 mi (6,843.01 km) |
| Williamstown to Ponte Buggianese | 4,219.74 mi (6,791.01 km) |
| Williamstown to Ponte San Pietro | 4,109.32 mi (6,613.31 km) |
| Williamstown to Pontecorvo | 4,430.38 mi (7,130.01 km) |
