| Ostrow Mazowiecka to Chitila | 602.18 mi (969.12 km) |
| Ostrow Mazowiecka to Cisnadie | 500.02 mi (804.70 km) |
| Ostrow Mazowiecka to Cluj-Napoca | 423.54 mi (681.62 km) |
| Ostrow Mazowiecka to Codlea | 515.99 mi (830.40 km) |
| Ostrow Mazowiecka to Comanesti | 484.75 mi (780.13 km) |
| Ostrow Mazowiecka to Comarnic | 548.15 mi (882.17 km) |
| Ostrow Mazowiecka to Constanta | 670.80 mi (1,079.55 km) |
| Ostrow Mazowiecka to Corabia | 634.93 mi (1,021.82 km) |
| Ostrow Mazowiecka to Costesti | 577.80 mi (929.87 km) |
| Ostrow Mazowiecka to Covasna | 517.34 mi (832.58 km) |
| Ostrow Mazowiecka to Craiova | 591.46 mi (951.87 km) |
| Ostrow Mazowiecka to Cristuru Secuiesc | 471.02 mi (758.03 km) |
| Ostrow Mazowiecka to Cugir | 485.11 mi (780.71 km) |
| Ostrow Mazowiecka to Cumpana | 672.58 mi (1,082.42 km) |
| Ostrow Mazowiecka to Curtea de Arges | 544.00 mi (875.49 km) |
