| Kastamonu to Nuth | 1,476.95 mi (2,376.91 km) |
| Kastamonu to Oegstgeest | 1,559.89 mi (2,510.40 km) |
| Kastamonu to Oirschot | 1,512.31 mi (2,433.82 km) |
| Kastamonu to Oisterwijk | 1,518.05 mi (2,443.07 km) |
| Kastamonu to Oldebroek | 1,508.08 mi (2,427.02 km) |
| Kastamonu to Oldenzaal | 1,463.96 mi (2,356.02 km) |
| Kastamonu to Ommen | 1,489.17 mi (2,396.59 km) |
| Kastamonu to Oosterend | 1,514.67 mi (2,437.63 km) |
| Kastamonu to Oosterhout | 1,533.34 mi (2,467.67 km) |
| Kastamonu to Oosterwolde | 1,505.61 mi (2,423.04 km) |
| Kastamonu to Oostzaan | 1,548.28 mi (2,491.72 km) |
| Kastamonu to Opmeer | 1,551.42 mi (2,496.77 km) |
| Kastamonu to Oss | 1,508.72 mi (2,428.06 km) |
| Kastamonu to Oud-Beijerland | 1,555.44 mi (2,503.25 km) |
| Kastamonu to Oudenbosch | 1,546.06 mi (2,488.15 km) |
