| Ostrow Mazowiecka to Montemor-o-Novo | 1,730.98 mi (2,785.75 km) |
| Ostrow Mazowiecka to Montemor-o-Velho | 1,677.86 mi (2,700.25 km) |
| Ostrow Mazowiecka to Montijo | 1,755.89 mi (2,825.83 km) |
| Ostrow Mazowiecka to Mortagua | 1,647.89 mi (2,652.02 km) |
| Ostrow Mazowiecka to Moura | 1,726.72 mi (2,778.90 km) |
| Ostrow Mazowiecka to Murtosa | 1,650.13 mi (2,655.63 km) |
| Ostrow Mazowiecka to Nazare | 1,719.15 mi (2,766.70 km) |
| Ostrow Mazowiecka to Nelas | 1,628.96 mi (2,621.56 km) |
| Ostrow Mazowiecka to Obidos | 1,734.02 mi (2,790.64 km) |
| Ostrow Mazowiecka to Odemira | 1,799.06 mi (2,895.31 km) |
| Ostrow Mazowiecka to Odivelas | 1,761.68 mi (2,835.15 km) |
| Ostrow Mazowiecka to Oeiras | 1,772.13 mi (2,851.96 km) |
| Ostrow Mazowiecka to Olhao | 1,796.73 mi (2,891.56 km) |
| Ostrow Mazowiecka to Oliveira de Azemeis | 1,639.04 mi (2,637.79 km) |
| Ostrow Mazowiecka to Oliveira de Frades | 1,633.03 mi (2,628.11 km) |
