| Ostrow Mazowiecka to Bumbesti-Jiu | 530.82 mi (854.28 km) |
| Ostrow Mazowiecka to Busteni | 536.16 mi (862.86 km) |
| Ostrow Mazowiecka to Buzau | 573.21 mi (922.49 km) |
| Ostrow Mazowiecka to Cajvana | 395.16 mi (635.95 km) |
| Ostrow Mazowiecka to Calafat | 610.91 mi (983.17 km) |
| Ostrow Mazowiecka to Calan | 490.60 mi (789.55 km) |
| Ostrow Mazowiecka to Calarasi | 643.71 mi (1,035.95 km) |
| Ostrow Mazowiecka to Campia Turzii | 440.86 mi (709.50 km) |
| Ostrow Mazowiecka to Campina | 557.63 mi (897.42 km) |
| Ostrow Mazowiecka to Campulung | 539.45 mi (868.16 km) |
| Ostrow Mazowiecka to Campulung Moldovenesc | 398.19 mi (640.83 km) |
| Ostrow Mazowiecka to Caracal | 610.54 mi (982.56 km) |
| Ostrow Mazowiecka to Caransebes | 510.02 mi (820.80 km) |
| Ostrow Mazowiecka to Carei | 354.37 mi (570.31 km) |
| Ostrow Mazowiecka to Cernavoda | 647.87 mi (1,042.64 km) |
