| Issum to Oliveira do Bairro | 1,041.31 mi (1,675.82 km) |
| Issum to Oliveira do Hospital | 1,029.64 mi (1,657.05 km) |
| Issum to Ourem | 1,091.18 mi (1,756.09 km) |
| Issum to Ovar | 1,026.74 mi (1,652.38 km) |
| Issum to Pacos de Ferreira | 997.66 mi (1,605.59 km) |
| Issum to Palmela | 1,162.54 mi (1,870.93 km) |
| Issum to Paredes | 999.01 mi (1,607.76 km) |
| Issum to Paredes de Coura | 969.23 mi (1,559.83 km) |
| Issum to Penacova | 1,047.83 mi (1,686.32 km) |
| Issum to Penafiel | 997.07 mi (1,604.63 km) |
| Issum to Peniche | 1,133.23 mi (1,823.76 km) |
| Issum to Peso da Regua | 982.70 mi (1,581.50 km) |
| Issum to Pinhal Novo | 1,159.32 mi (1,865.74 km) |
| Issum to Pinhel | 981.24 mi (1,579.15 km) |
| Issum to Pombal | 1,078.36 mi (1,735.45 km) |
