| Rockville to Montalegre | 3,549.40 mi (5,712.21 km) |
| Rockville to Montemor-o-Novo | 3,613.16 mi (5,814.83 km) |
| Rockville to Montemor-o-Velho | 3,549.18 mi (5,711.85 km) |
| Rockville to Montijo | 3,578.46 mi (5,758.97 km) |
| Rockville to Mortagua | 3,564.07 mi (5,735.82 km) |
| Rockville to Moura | 3,665.63 mi (5,899.25 km) |
| Rockville to Murtosa | 3,536.80 mi (5,691.93 km) |
| Rockville to Nazare | 3,545.43 mi (5,705.82 km) |
| Rockville to Nelas | 3,580.49 mi (5,762.23 km) |
| Rockville to Obidos | 3,547.41 mi (5,709.01 km) |
| Rockville to Odemira | 3,622.47 mi (5,829.80 km) |
| Rockville to Odivelas | 3,561.69 mi (5,731.98 km) |
| Rockville to Oeiras | 3,557.82 mi (5,725.76 km) |
| Rockville to Olhao | 3,678.10 mi (5,919.33 km) |
| Rockville to Oliveira de Azemeis | 3,541.71 mi (5,699.84 km) |
