| Kastamonu to Octeville | 1,788.29 mi (2,877.97 km) |
| Kastamonu to Oignies | 1,592.79 mi (2,563.35 km) |
| Kastamonu to Oissel | 1,664.18 mi (2,678.24 km) |
| Kastamonu to Olivet | 1,617.56 mi (2,603.21 km) |
| Kastamonu to Ollioules | 1,426.79 mi (2,296.20 km) |
| Kastamonu to Olonne-sur-Mer | 1,787.87 mi (2,877.30 km) |
| Kastamonu to Oloron-Sainte-Marie | 1,749.61 mi (2,815.73 km) |
| Kastamonu to Onet Village | 1,582.76 mi (2,547.21 km) |
| Kastamonu to Onnaing | 1,565.60 mi (2,519.59 km) |
| Kastamonu to Orange | 1,474.09 mi (2,372.33 km) |
| Kastamonu to Orchies | 1,582.07 mi (2,546.09 km) |
| Kastamonu to Orleans | 1,617.37 mi (2,602.90 km) |
| Kastamonu to Orly | 1,600.79 mi (2,576.22 km) |
| Kastamonu to Ormesson-sur-Marne | 1,594.55 mi (2,566.18 km) |
| Kastamonu to Orsay | 1,609.73 mi (2,590.61 km) |
