| Ostrow Mazowiecka to Ramnicu Sarat | 562.98 mi (906.02 km) |
| Ostrow Mazowiecka to Ramnicu Valcea | 543.34 mi (874.42 km) |
| Ostrow Mazowiecka to Rasnov | 523.07 mi (841.80 km) |
| Ostrow Mazowiecka to Reghin | 434.59 mi (699.40 km) |
| Ostrow Mazowiecka to Resita | 518.14 mi (833.87 km) |
| Ostrow Mazowiecka to Roman | 463.07 mi (745.23 km) |
| Ostrow Mazowiecka to Rosiori de Vede | 616.69 mi (992.46 km) |
| Ostrow Mazowiecka to Rovinari | 547.96 mi (881.86 km) |
| Ostrow Mazowiecka to Roznov | 460.31 mi (740.79 km) |
| Ostrow Mazowiecka to Sabaoani | 456.02 mi (733.89 km) |
| Ostrow Mazowiecka to Sacele | 524.86 mi (844.68 km) |
| Ostrow Mazowiecka to Sacueni | 376.48 mi (605.89 km) |
| Ostrow Mazowiecka to Salcea | 406.82 mi (654.72 km) |
| Ostrow Mazowiecka to Salonta | 414.71 mi (667.41 km) |
| Ostrow Mazowiecka to Sangeorgiu de Mures | 446.75 mi (718.97 km) |
