| Ostrow Mazowiecka to Karditsa | 928.15 mi (1,493.72 km) |
| Ostrow Mazowiecka to Kastoria | 849.22 mi (1,366.68 km) |
| Ostrow Mazowiecka to Katerini | 866.43 mi (1,394.38 km) |
| Ostrow Mazowiecka to Keratsini | 1,028.18 mi (1,654.70 km) |
| Ostrow Mazowiecka to Kerkyra | 915.19 mi (1,472.86 km) |
| Ostrow Mazowiecka to Kiato | 1,022.69 mi (1,645.86 km) |
| Ostrow Mazowiecka to Kifisia | 1,020.97 mi (1,643.09 km) |
| Ostrow Mazowiecka to Kilkis | 817.71 mi (1,315.98 km) |
| Ostrow Mazowiecka to Komotini | 824.97 mi (1,327.66 km) |
| Ostrow Mazowiecka to Korinthos | 1,028.01 mi (1,654.41 km) |
| Ostrow Mazowiecka to Koropi | 1,033.84 mi (1,663.80 km) |
| Ostrow Mazowiecka to Korydallos | 1,027.17 mi (1,653.07 km) |
| Ostrow Mazowiecka to Kos | 1,131.82 mi (1,821.49 km) |
| Ostrow Mazowiecka to Kozani | 863.68 mi (1,389.96 km) |
| Ostrow Mazowiecka to Lagos | 823.78 mi (1,325.75 km) |
