| Kastamonu to Opole | 991.23 mi (1,595.24 km) |
| Kastamonu to Orzesze | 941.41 mi (1,515.05 km) |
| Kastamonu to Osowa | 1,141.88 mi (1,837.68 km) |
| Kastamonu to Ostroda | 1,063.72 mi (1,711.89 km) |
| Kastamonu to Ostroleka | 987.36 mi (1,589.00 km) |
| Kastamonu to Ostrow Mazowiecka | 964.32 mi (1,551.92 km) |
| Kastamonu to Ostrow Wielkopolski | 1,034.92 mi (1,665.54 km) |
| Kastamonu to Ostrowiec Swietokrzyski | 884.72 mi (1,423.82 km) |
| Kastamonu to Ostrzeszow | 1,021.26 mi (1,643.57 km) |
| Kastamonu to Oswiecim | 919.83 mi (1,480.32 km) |
| Kastamonu to Otwock | 946.68 mi (1,523.54 km) |
| Kastamonu to Ozarow Mazowiecki | 965.36 mi (1,553.60 km) |
| Kastamonu to Ozimek | 981.39 mi (1,579.40 km) |
| Kastamonu to Ozorkow | 1,000.17 mi (1,609.61 km) |
| Kastamonu to Pabianice | 982.60 mi (1,581.34 km) |
