| Riverdale to Montalegre | 4,088.77 mi (6,580.24 km) |
| Riverdale to Montemor-o-Novo | 4,142.86 mi (6,667.29 km) |
| Riverdale to Montemor-o-Velho | 4,083.17 mi (6,571.22 km) |
| Riverdale to Montijo | 4,107.55 mi (6,610.47 km) |
| Riverdale to Mortagua | 4,099.24 mi (6,597.09 km) |
| Riverdale to Moura | 4,194.46 mi (6,750.33 km) |
| Riverdale to Murtosa | 4,072.51 mi (6,554.07 km) |
| Riverdale to Nazare | 4,077.32 mi (6,561.81 km) |
| Riverdale to Nelas | 4,116.22 mi (6,624.42 km) |
| Riverdale to Obidos | 4,078.45 mi (6,563.63 km) |
| Riverdale to Odemira | 4,148.14 mi (6,675.78 km) |
| Riverdale to Odivelas | 4,090.85 mi (6,583.59 km) |
| Riverdale to Oeiras | 4,086.49 mi (6,576.57 km) |
| Riverdale to Olhao | 4,202.77 mi (6,763.71 km) |
| Riverdale to Oliveira de Azemeis | 4,077.86 mi (6,562.68 km) |
