| Keystone to Montalegre | 4,206.49 mi (6,769.69 km) |
| Keystone to Montemor-o-Novo | 4,236.97 mi (6,818.74 km) |
| Keystone to Montemor-o-Velho | 4,187.46 mi (6,739.07 km) |
| Keystone to Montijo | 4,200.68 mi (6,760.35 km) |
| Keystone to Mortagua | 4,206.22 mi (6,769.26 km) |
| Keystone to Moura | 4,286.25 mi (6,898.05 km) |
| Keystone to Murtosa | 4,181.01 mi (6,728.68 km) |
| Keystone to Nazare | 4,176.84 mi (6,721.98 km) |
| Keystone to Nelas | 4,224.44 mi (6,798.58 km) |
| Keystone to Obidos | 4,176.05 mi (6,720.71 km) |
| Keystone to Odemira | 4,233.76 mi (6,813.58 km) |
| Keystone to Odivelas | 4,184.26 mi (6,733.92 km) |
| Keystone to Oeiras | 4,178.88 mi (6,725.26 km) |
| Keystone to Olhao | 4,285.88 mi (6,897.46 km) |
| Keystone to Oliveira de Azemeis | 4,187.39 mi (6,738.95 km) |
