| Middle Island to Montalegre | 3,294.72 mi (5,302.34 km) |
| Middle Island to Montemor-o-Novo | 3,360.29 mi (5,407.86 km) |
| Middle Island to Montemor-o-Velho | 3,295.41 mi (5,303.45 km) |
| Middle Island to Montijo | 3,325.73 mi (5,352.24 km) |
| Middle Island to Mortagua | 3,310.08 mi (5,327.05 km) |
| Middle Island to Moura | 3,412.93 mi (5,492.57 km) |
| Middle Island to Murtosa | 3,282.71 mi (5,283.02 km) |
| Middle Island to Nazare | 3,292.09 mi (5,298.11 km) |
| Middle Island to Nelas | 3,326.38 mi (5,353.30 km) |
| Middle Island to Obidos | 3,294.26 mi (5,301.61 km) |
| Middle Island to Odemira | 3,370.54 mi (5,424.36 km) |
| Middle Island to Odivelas | 3,308.95 mi (5,325.24 km) |
| Middle Island to Oeiras | 3,305.20 mi (5,319.21 km) |
| Middle Island to Olhao | 3,426.40 mi (5,514.25 km) |
| Middle Island to Oliveira de Azemeis | 3,287.55 mi (5,290.80 km) |
