| Isernia to Poggio a Caiano | 222.11 mi (357.46 km) |
| Isernia to Poggio Renatico | 258.85 mi (416.57 km) |
| Isernia to Poggiomarino | 57.77 mi (92.97 km) |
| Isernia to Poirino | 394.80 mi (635.36 km) |
| Isernia to Policoro | 159.55 mi (256.77 km) |
| Isernia to Polistena | 241.48 mi (388.63 km) |
| Isernia to Pomezia | 89.84 mi (144.59 km) |
| Isernia to Pomigliano d'Arco | 48.13 mi (77.46 km) |
| Isernia to Pompei | 60.46 mi (97.30 km) |
| Isernia to Ponsacco | 230.17 mi (370.42 km) |
| Isernia to Pontassieve | 206.81 mi (332.82 km) |
| Isernia to Ponte Buggianese | 235.19 mi (378.50 km) |
| Isernia to Ponte San Pietro | 366.11 mi (589.19 km) |
| Isernia to Pontecorvo | 31.14 mi (50.11 km) |
| Isernia to Pontedera | 232.06 mi (373.46 km) |
