| Ostrow Mazowiecka to Jozefow | 53.94 mi (86.81 km) |
| Ostrow Mazowiecka to Kalisz | 176.79 mi (284.51 km) |
| Ostrow Mazowiecka to Kamien Pomorski | 304.49 mi (490.04 km) |
| Ostrow Mazowiecka to Kamienna Gora | 286.71 mi (461.42 km) |
| Ostrow Mazowiecka to Karczew | 56.58 mi (91.06 km) |
| Ostrow Mazowiecka to Kartuzy | 185.09 mi (297.88 km) |
| Ostrow Mazowiecka to Katowice | 214.42 mi (345.08 km) |
| Ostrow Mazowiecka to Kedzierzyn-Kozle | 232.10 mi (373.53 km) |
| Ostrow Mazowiecka to Kepno | 196.65 mi (316.48 km) |
| Ostrow Mazowiecka to Ketrzyn | 91.18 mi (146.74 km) |
| Ostrow Mazowiecka to Kety | 231.38 mi (372.38 km) |
| Ostrow Mazowiecka to Kielce | 143.62 mi (231.14 km) |
| Ostrow Mazowiecka to Kielczow | 231.32 mi (372.28 km) |
| Ostrow Mazowiecka to Klobuck | 181.52 mi (292.12 km) |
| Ostrow Mazowiecka to Klodzko | 278.22 mi (447.75 km) |
