| Rio Grande City to Montalegre | 5,077.19 mi (8,170.94 km) |
| Rio Grande City to Montemor-o-Novo | 5,135.57 mi (8,264.90 km) |
| Rio Grande City to Montemor-o-Velho | 5,074.49 mi (8,166.61 km) |
| Rio Grande City to Montijo | 5,100.39 mi (8,208.29 km) |
| Rio Grande City to Mortagua | 5,090.06 mi (8,191.67 km) |
| Rio Grande City to Moura | 5,187.37 mi (8,348.27 km) |
| Rio Grande City to Murtosa | 5,063.07 mi (8,148.22 km) |
| Rio Grande City to Nazare | 5,069.40 mi (8,158.41 km) |
| Rio Grande City to Nelas | 5,106.78 mi (8,218.57 km) |
| Rio Grande City to Obidos | 5,070.79 mi (8,160.65 km) |
| Rio Grande City to Odemira | 5,141.55 mi (8,274.53 km) |
| Rio Grande City to Odivelas | 5,083.67 mi (8,181.37 km) |
| Rio Grande City to Oeiras | 5,079.41 mi (8,174.52 km) |
| Rio Grande City to Olhao | 5,196.29 mi (8,362.62 km) |
| Rio Grande City to Oliveira de Azemeis | 5,068.20 mi (8,156.49 km) |
