| Isernia to Oliveira do Bairro | 1,183.64 mi (1,904.88 km) |
| Isernia to Oliveira do Hospital | 1,152.90 mi (1,855.41 km) |
| Isernia to Ourem | 1,200.01 mi (1,931.23 km) |
| Isernia to Ovar | 1,186.07 mi (1,908.80 km) |
| Isernia to Pacos de Ferreira | 1,169.59 mi (1,882.28 km) |
| Isernia to Palmela | 1,237.22 mi (1,991.11 km) |
| Isernia to Paredes | 1,166.87 mi (1,877.89 km) |
| Isernia to Paredes de Coura | 1,171.96 mi (1,886.09 km) |
| Isernia to Penacova | 1,175.84 mi (1,892.34 km) |
| Isernia to Penafiel | 1,164.27 mi (1,873.72 km) |
| Isernia to Peniche | 1,246.46 mi (2,005.99 km) |
| Isernia to Peso da Regua | 1,138.62 mi (1,832.44 km) |
| Isernia to Pinhal Novo | 1,236.64 mi (1,990.18 km) |
| Isernia to Pinhel | 1,106.40 mi (1,780.58 km) |
| Isernia to Pombal | 1,198.91 mi (1,929.47 km) |
