| Ostrow Mazowiecka to Klaukkala | 534.83 mi (860.73 km) |
| Ostrow Mazowiecka to Kokkola | 763.84 mi (1,229.28 km) |
| Ostrow Mazowiecka to Kontiolahti | 747.01 mi (1,202.19 km) |
| Ostrow Mazowiecka to Korsholm | 712.57 mi (1,146.77 km) |
| Ostrow Mazowiecka to Kotka | 562.90 mi (905.90 km) |
| Ostrow Mazowiecka to Kouvola | 585.90 mi (942.91 km) |
| Ostrow Mazowiecka to Kuhmo | 828.10 mi (1,332.70 km) |
| Ostrow Mazowiecka to Kuopio | 728.27 mi (1,172.03 km) |
| Ostrow Mazowiecka to Kurikka | 678.51 mi (1,091.96 km) |
| Ostrow Mazowiecka to Kuusamo | 943.64 mi (1,518.64 km) |
| Ostrow Mazowiecka to Kuusankoski | 587.59 mi (945.63 km) |
| Ostrow Mazowiecka to Lahti | 582.61 mi (937.63 km) |
| Ostrow Mazowiecka to Laitila | 558.55 mi (898.90 km) |
| Ostrow Mazowiecka to Lapinlahti | 756.39 mi (1,217.30 km) |
| Ostrow Mazowiecka to Lappeenranta | 617.67 mi (994.05 km) |
