| Four Corners to Montalegre | 5,232.59 mi (8,421.04 km) |
| Four Corners to Montemor-o-Novo | 5,382.67 mi (8,662.58 km) |
| Four Corners to Montemor-o-Velho | 5,287.54 mi (8,509.48 km) |
| Four Corners to Montijo | 5,356.62 mi (8,620.65 km) |
| Four Corners to Mortagua | 5,289.45 mi (8,512.54 km) |
| Four Corners to Moura | 5,436.84 mi (8,749.75 km) |
| Four Corners to Murtosa | 5,260.02 mi (8,465.18 km) |
| Four Corners to Nazare | 5,303.31 mi (8,534.85 km) |
| Four Corners to Nelas | 5,298.41 mi (8,526.97 km) |
| Four Corners to Obidos | 5,312.56 mi (8,549.74 km) |
| Four Corners to Odemira | 5,423.28 mi (8,727.93 km) |
| Four Corners to Odivelas | 5,341.10 mi (8,595.66 km) |
| Four Corners to Oeiras | 5,341.72 mi (8,596.66 km) |
| Four Corners to Olhao | 5,480.90 mi (8,820.66 km) |
| Four Corners to Oliveira de Azemeis | 5,260.00 mi (8,465.15 km) |
