| Silver Spring to Montalegre | 3,545.47 mi (5,705.88 km) |
| Silver Spring to Montemor-o-Novo | 3,608.68 mi (5,807.61 km) |
| Silver Spring to Montemor-o-Velho | 3,544.91 mi (5,704.99 km) |
| Silver Spring to Montijo | 3,573.94 mi (5,751.70 km) |
| Silver Spring to Mortagua | 3,559.88 mi (5,729.07 km) |
| Silver Spring to Moura | 3,661.10 mi (5,891.97 km) |
| Silver Spring to Murtosa | 3,532.64 mi (5,685.23 km) |
| Silver Spring to Nazare | 3,541.05 mi (5,698.77 km) |
| Silver Spring to Nelas | 3,576.32 mi (5,755.54 km) |
| Silver Spring to Obidos | 3,542.99 mi (5,701.90 km) |
| Silver Spring to Odemira | 3,617.79 mi (5,822.27 km) |
| Silver Spring to Odivelas | 3,557.17 mi (5,724.71 km) |
| Silver Spring to Oeiras | 3,553.28 mi (5,718.45 km) |
| Silver Spring to Olhao | 3,673.38 mi (5,911.73 km) |
| Silver Spring to Oliveira de Azemeis | 3,537.57 mi (5,693.18 km) |
