| Oak Park to Montalegre | 3,952.76 mi (6,361.36 km) |
| Oak Park to Montemor-o-Novo | 4,043.25 mi (6,506.98 km) |
| Oak Park to Montemor-o-Velho | 3,968.80 mi (6,387.17 km) |
| Oak Park to Montijo | 4,010.38 mi (6,454.08 km) |
| Oak Park to Mortagua | 3,980.19 mi (6,405.50 km) |
| Oak Park to Moura | 4,097.24 mi (6,593.88 km) |
| Oak Park to Murtosa | 3,951.69 mi (6,359.63 km) |
| Oak Park to Nazare | 3,970.72 mi (6,390.25 km) |
| Oak Park to Nelas | 3,994.78 mi (6,428.97 km) |
| Oak Park to Obidos | 3,974.89 mi (6,396.96 km) |
| Oak Park to Odemira | 4,061.86 mi (6,536.93 km) |
| Oak Park to Odivelas | 3,993.64 mi (6,427.14 km) |
| Oak Park to Oeiras | 3,991.01 mi (6,422.91 km) |
| Oak Park to Olhao | 4,119.11 mi (6,629.07 km) |
| Oak Park to Oliveira de Azemeis | 3,955.26 mi (6,365.37 km) |
