| Issum to Montemor-o-Novo | 1,137.07 mi (1,829.93 km) |
| Issum to Montemor-o-Velho | 1,066.33 mi (1,716.10 km) |
| Issum to Montijo | 1,155.92 mi (1,860.27 km) |
| Issum to Mortagua | 1,037.29 mi (1,669.35 km) |
| Issum to Moura | 1,144.76 mi (1,842.31 km) |
| Issum to Murtosa | 1,033.92 mi (1,663.93 km) |
| Issum to Nazare | 1,109.81 mi (1,786.07 km) |
| Issum to Nelas | 1,020.52 mi (1,642.37 km) |
| Issum to Obidos | 1,126.11 mi (1,812.30 km) |
| Issum to Odemira | 1,211.19 mi (1,949.22 km) |
| Issum to Odivelas | 1,158.55 mi (1,864.50 km) |
| Issum to Oeiras | 1,168.85 mi (1,881.09 km) |
| Issum to Olhao | 1,221.39 mi (1,965.64 km) |
| Issum to Oliveira de Azemeis | 1,022.98 mi (1,646.33 km) |
| Issum to Oliveira de Frades | 1,020.19 mi (1,641.84 km) |
