| Clarksburg to Montalegre | 3,550.30 mi (5,713.66 km) |
| Clarksburg to Montemor-o-Novo | 3,614.83 mi (5,817.51 km) |
| Clarksburg to Montemor-o-Velho | 3,550.53 mi (5,714.03 km) |
| Clarksburg to Montijo | 3,580.17 mi (5,761.73 km) |
| Clarksburg to Mortagua | 3,565.33 mi (5,737.84 km) |
| Clarksburg to Moura | 3,667.35 mi (5,902.03 km) |
| Clarksburg to Murtosa | 3,538.02 mi (5,693.89 km) |
| Clarksburg to Nazare | 3,546.94 mi (5,708.25 km) |
| Clarksburg to Nelas | 3,581.70 mi (5,764.18 km) |
| Clarksburg to Obidos | 3,548.99 mi (5,711.55 km) |
| Clarksburg to Odemira | 3,624.41 mi (5,832.92 km) |
| Clarksburg to Odivelas | 3,563.40 mi (5,734.74 km) |
| Clarksburg to Oeiras | 3,559.57 mi (5,728.57 km) |
| Clarksburg to Olhao | 3,680.10 mi (5,922.55 km) |
| Clarksburg to Oliveira de Azemeis | 3,542.89 mi (5,701.74 km) |
