| Middlesex to Montalegre | 3,377.81 mi (5,436.06 km) |
| Middlesex to Montemor-o-Novo | 3,444.15 mi (5,542.83 km) |
| Middlesex to Montemor-o-Velho | 3,379.01 mi (5,437.99 km) |
| Middlesex to Montijo | 3,409.63 mi (5,487.27 km) |
| Middlesex to Mortagua | 3,393.58 mi (5,461.44 km) |
| Middlesex to Moura | 3,496.83 mi (5,627.60 km) |
| Middlesex to Murtosa | 3,366.18 mi (5,417.34 km) |
| Middlesex to Nazare | 3,375.84 mi (5,432.89 km) |
| Middlesex to Nelas | 3,409.84 mi (5,487.60 km) |
| Middlesex to Obidos | 3,378.06 mi (5,436.46 km) |
| Middlesex to Odemira | 3,454.58 mi (5,559.61 km) |
| Middlesex to Odivelas | 3,392.85 mi (5,460.26 km) |
| Middlesex to Oeiras | 3,389.13 mi (5,454.27 km) |
| Middlesex to Olhao | 3,510.47 mi (5,649.55 km) |
| Middlesex to Oliveira de Azemeis | 3,370.97 mi (5,425.05 km) |
