| Ostrow Mazowiecka to Karis | 506.81 mi (815.63 km) |
| Ostrow Mazowiecka to Karkkila | 541.42 mi (871.34 km) |
| Ostrow Mazowiecka to Kauhajoki | 665.58 mi (1,071.15 km) |
| Ostrow Mazowiecka to Kauhava | 712.92 mi (1,147.33 km) |
| Ostrow Mazowiecka to Kauniainen | 523.58 mi (842.62 km) |
| Ostrow Mazowiecka to Kemi | 898.53 mi (1,446.05 km) |
| Ostrow Mazowiecka to Kemijarvi | 979.71 mi (1,576.69 km) |
| Ostrow Mazowiecka to Kempele | 846.43 mi (1,362.19 km) |
| Ostrow Mazowiecka to Kerava | 538.87 mi (867.22 km) |
| Ostrow Mazowiecka to Keuruu | 661.60 mi (1,064.74 km) |
| Ostrow Mazowiecka to Kiiminki | 862.85 mi (1,388.63 km) |
| Ostrow Mazowiecka to Kirkkonummi | 514.49 mi (827.99 km) |
| Ostrow Mazowiecka to Kitee | 710.45 mi (1,143.35 km) |
| Ostrow Mazowiecka to Kiuruvesi | 768.54 mi (1,236.85 km) |
| Ostrow Mazowiecka to Kivisto | 531.65 mi (855.61 km) |
