| Gaithersburg to Montalegre | 3,550.58 mi (5,714.10 km) |
| Gaithersburg to Montemor-o-Novo | 3,614.64 mi (5,817.21 km) |
| Gaithersburg to Montemor-o-Velho | 3,550.53 mi (5,714.03 km) |
| Gaithersburg to Montijo | 3,579.95 mi (5,761.38 km) |
| Gaithersburg to Mortagua | 3,565.39 mi (5,737.94 km) |
| Gaithersburg to Moura | 3,667.13 mi (5,901.67 km) |
| Gaithersburg to Murtosa | 3,538.10 mi (5,694.02 km) |
| Gaithersburg to Nazare | 3,546.85 mi (5,708.10 km) |
| Gaithersburg to Nelas | 3,581.78 mi (5,764.32 km) |
| Gaithersburg to Obidos | 3,548.86 mi (5,711.33 km) |
| Gaithersburg to Odemira | 3,624.05 mi (5,832.35 km) |
| Gaithersburg to Odivelas | 3,563.18 mi (5,734.39 km) |
| Gaithersburg to Oeiras | 3,559.33 mi (5,728.19 km) |
| Gaithersburg to Olhao | 3,679.71 mi (5,921.92 km) |
| Gaithersburg to Oliveira de Azemeis | 3,543.00 mi (5,701.90 km) |
