| Ostrow Mazowiecka to Marco de Canavezes | 1,610.78 mi (2,592.30 km) |
| Ostrow Mazowiecka to Marinha Grande | 1,706.93 mi (2,747.04 km) |
| Ostrow Mazowiecka to Massama | 1,766.99 mi (2,843.70 km) |
| Ostrow Mazowiecka to Matosinhos | 1,632.70 mi (2,627.57 km) |
| Ostrow Mazowiecka to Mealhada | 1,658.73 mi (2,669.47 km) |
| Ostrow Mazowiecka to Melgaco | 1,574.67 mi (2,534.18 km) |
| Ostrow Mazowiecka to Melres | 1,625.92 mi (2,616.66 km) |
| Ostrow Mazowiecka to Mira | 1,667.66 mi (2,683.85 km) |
| Ostrow Mazowiecka to Miranda do Corvo | 1,667.12 mi (2,682.98 km) |
| Ostrow Mazowiecka to Mirandela | 1,558.90 mi (2,508.80 km) |
| Ostrow Mazowiecka to Mogadouro | 1,547.30 mi (2,490.14 km) |
| Ostrow Mazowiecka to Moimenta da Beira | 1,598.62 mi (2,572.73 km) |
| Ostrow Mazowiecka to Moita | 1,760.72 mi (2,833.61 km) |
| Ostrow Mazowiecka to Moncao | 1,585.10 mi (2,550.98 km) |
| Ostrow Mazowiecka to Montalegre | 1,568.32 mi (2,523.96 km) |
