| Ostrow Mazowiecka to Marghita | 377.05 mi (606.80 km) |
| Ostrow Mazowiecka to Marginea | 385.44 mi (620.31 km) |
| Ostrow Mazowiecka to Matca | 542.69 mi (873.38 km) |
| Ostrow Mazowiecka to Medgidia | 657.94 mi (1,058.85 km) |
| Ostrow Mazowiecka to Media | 472.38 mi (760.22 km) |
| Ostrow Mazowiecka to Miercurea-Ciuc | 477.92 mi (769.14 km) |
| Ostrow Mazowiecka to Mioveni | 559.11 mi (899.80 km) |
| Ostrow Mazowiecka to Mizil | 576.75 mi (928.19 km) |
| Ostrow Mazowiecka to Moinesti | 485.15 mi (780.77 km) |
| Ostrow Mazowiecka to Moisei | 373.98 mi (601.87 km) |
| Ostrow Mazowiecka to Moldova Noua | 558.53 mi (898.86 km) |
| Ostrow Mazowiecka to Moreni | 566.23 mi (911.26 km) |
| Ostrow Mazowiecka to Motru | 554.63 mi (892.58 km) |
| Ostrow Mazowiecka to Murfatlar | 665.74 mi (1,071.41 km) |
| Ostrow Mazowiecka to Nasaud | 397.00 mi (638.91 km) |
