| Kastamonu to Opwijk | 1,549.42 mi (2,493.55 km) |
| Kastamonu to Ostend | 1,606.91 mi (2,586.07 km) |
| Kastamonu to Oud-Heverlee | 1,526.76 mi (2,457.08 km) |
| Kastamonu to Oud-Turnhout | 1,521.96 mi (2,449.36 km) |
| Kastamonu to Oudenaarde | 1,572.30 mi (2,530.38 km) |
| Kastamonu to Oudenburg | 1,602.85 mi (2,579.54 km) |
| Kastamonu to Oupeye | 1,483.29 mi (2,387.12 km) |
| Kastamonu to Overijse | 1,531.59 mi (2,464.86 km) |
| Kastamonu to Overpelt | 1,502.06 mi (2,417.33 km) |
| Kastamonu to Paal | 1,508.99 mi (2,428.49 km) |
| Kastamonu to Peer | 1,498.95 mi (2,412.33 km) |
| Kastamonu to Pepinster | 1,473.44 mi (2,371.28 km) |
| Kastamonu to Peruwelz | 1,568.07 mi (2,523.56 km) |
| Kastamonu to Perwez | 1,517.01 mi (2,441.40 km) |
| Kastamonu to Philippeville | 1,521.80 mi (2,449.10 km) |
