| Den Helder to Montemor-o-Novo | 1,163.98 mi (1,873.25 km) |
| Den Helder to Montemor-o-Velho | 1,084.98 mi (1,746.11 km) |
| Den Helder to Montijo | 1,179.49 mi (1,898.21 km) |
| Den Helder to Mortagua | 1,056.98 mi (1,701.04 km) |
| Den Helder to Moura | 1,177.14 mi (1,894.42 km) |
| Den Helder to Murtosa | 1,050.28 mi (1,690.26 km) |
| Den Helder to Nazare | 1,129.02 mi (1,816.98 km) |
| Den Helder to Nelas | 1,041.76 mi (1,676.55 km) |
| Den Helder to Obidos | 1,145.87 mi (1,844.11 km) |
| Den Helder to Odemira | 1,239.85 mi (1,995.34 km) |
| Den Helder to Odivelas | 1,180.42 mi (1,899.70 km) |
| Den Helder to Oeiras | 1,190.50 mi (1,915.92 km) |
| Den Helder to Olhao | 1,255.45 mi (2,020.45 km) |
| Den Helder to Oliveira de Azemeis | 1,039.63 mi (1,673.12 km) |
| Den Helder to Oliveira de Frades | 1,038.86 mi (1,671.88 km) |
