| Ostrow Mazowiecka to Koscian | 226.54 mi (364.57 km) |
| Ostrow Mazowiecka to Koscielisko | 258.27 mi (415.64 km) |
| Ostrow Mazowiecka to Koscierzyna | 185.00 mi (297.73 km) |
| Ostrow Mazowiecka to Kostrzyn | 198.28 mi (319.09 km) |
| Ostrow Mazowiecka to Kostrzyn nad Odra | 303.12 mi (487.83 km) |
| Ostrow Mazowiecka to Koszalin | 253.99 mi (408.75 km) |
| Ostrow Mazowiecka to Kowary | 293.91 mi (473.00 km) |
| Ostrow Mazowiecka to Kozienice | 85.24 mi (137.18 km) |
| Ostrow Mazowiecka to Kozuchow | 275.94 mi (444.09 km) |
| Ostrow Mazowiecka to Kozy | 234.84 mi (377.94 km) |
| Ostrow Mazowiecka to Krakow | 207.23 mi (333.51 km) |
| Ostrow Mazowiecka to Krapkowice | 233.27 mi (375.41 km) |
| Ostrow Mazowiecka to Krasnik | 130.82 mi (210.54 km) |
| Ostrow Mazowiecka to Krasnystaw | 136.93 mi (220.36 km) |
| Ostrow Mazowiecka to Krosno | 215.44 mi (346.72 km) |
