| Lake Oswego to Montalegre | 5,199.36 mi (8,367.57 km) |
| Lake Oswego to Montemor-o-Novo | 5,350.05 mi (8,610.08 km) |
| Lake Oswego to Montemor-o-Velho | 5,254.72 mi (8,456.66 km) |
| Lake Oswego to Montijo | 5,324.11 mi (8,568.32 km) |
| Lake Oswego to Mortagua | 5,256.52 mi (8,459.54 km) |
| Lake Oswego to Moura | 5,404.19 mi (8,697.20 km) |
| Lake Oswego to Murtosa | 5,227.09 mi (8,412.19 km) |
| Lake Oswego to Nazare | 5,270.65 mi (8,482.29 km) |
| Lake Oswego to Nelas | 5,265.41 mi (8,473.86 km) |
| Lake Oswego to Obidos | 5,279.96 mi (8,497.27 km) |
| Lake Oswego to Odemira | 5,390.92 mi (8,675.85 km) |
| Lake Oswego to Odivelas | 5,308.60 mi (8,543.37 km) |
| Lake Oswego to Oeiras | 5,309.26 mi (8,544.43 km) |
| Lake Oswego to Olhao | 5,448.51 mi (8,768.53 km) |
| Lake Oswego to Oliveira de Azemeis | 5,227.04 mi (8,412.10 km) |
