| Mount Vernon to Montalegre | 3,336.09 mi (5,368.92 km) |
| Mount Vernon to Montemor-o-Novo | 3,403.01 mi (5,476.61 km) |
| Mount Vernon to Montemor-o-Velho | 3,337.61 mi (5,371.36 km) |
| Mount Vernon to Montijo | 3,368.53 mi (5,421.12 km) |
| Mount Vernon to Mortagua | 3,352.10 mi (5,394.69 km) |
| Mount Vernon to Moura | 3,455.74 mi (5,561.47 km) |
| Mount Vernon to Murtosa | 3,324.67 mi (5,350.54 km) |
| Mount Vernon to Nazare | 3,334.57 mi (5,366.46 km) |
| Mount Vernon to Nelas | 3,368.32 mi (5,420.79 km) |
| Mount Vernon to Obidos | 3,336.84 mi (5,370.13 km) |
| Mount Vernon to Odemira | 3,413.70 mi (5,493.81 km) |
| Mount Vernon to Odivelas | 3,351.75 mi (5,394.12 km) |
| Mount Vernon to Oeiras | 3,348.06 mi (5,388.18 km) |
| Mount Vernon to Olhao | 3,469.64 mi (5,583.85 km) |
| Mount Vernon to Oliveira de Azemeis | 3,329.44 mi (5,358.21 km) |
