| Ostrow Mazowiecka to Chojnice | 190.24 mi (306.16 km) |
| Ostrow Mazowiecka to Chojnow | 274.75 mi (442.17 km) |
| Ostrow Mazowiecka to Chorzow | 214.21 mi (344.73 km) |
| Ostrow Mazowiecka to Choszczno | 270.78 mi (435.78 km) |
| Ostrow Mazowiecka to Chrzanow | 213.34 mi (343.34 km) |
| Ostrow Mazowiecka to Ciechanow | 53.07 mi (85.41 km) |
| Ostrow Mazowiecka to Ciechocinek | 130.19 mi (209.52 km) |
| Ostrow Mazowiecka to Cieszyn | 253.61 mi (408.14 km) |
| Ostrow Mazowiecka to Czarna Bialostocka | 67.04 mi (107.89 km) |
| Ostrow Mazowiecka to Czarnkow | 222.59 mi (358.23 km) |
| Ostrow Mazowiecka to Czechowice-Dziedzice | 235.27 mi (378.63 km) |
| Ostrow Mazowiecka to Czeladz | 208.97 mi (336.30 km) |
| Ostrow Mazowiecka to Czersk Pomorski | 176.01 mi (283.27 km) |
| Ostrow Mazowiecka to Czestochowa | 182.29 mi (293.36 km) |
| Ostrow Mazowiecka to Czluchow | 196.77 mi (316.67 km) |
