| Duzce to Octeville | 1,691.16 mi (2,721.65 km) |
| Duzce to Oignies | 1,501.80 mi (2,416.91 km) |
| Duzce to Oissel | 1,566.85 mi (2,521.61 km) |
| Duzce to Olivet | 1,514.04 mi (2,436.61 km) |
| Duzce to Ollioules | 1,304.46 mi (2,099.33 km) |
| Duzce to Olonne-sur-Mer | 1,678.53 mi (2,701.33 km) |
| Duzce to Oloron-Sainte-Marie | 1,628.79 mi (2,621.29 km) |
| Duzce to Onet Village | 1,465.28 mi (2,358.14 km) |
| Duzce to Onnaing | 1,474.66 mi (2,373.24 km) |
| Duzce to Orange | 1,355.60 mi (2,181.63 km) |
| Duzce to Orchies | 1,491.28 mi (2,399.99 km) |
| Duzce to Orleans | 1,514.02 mi (2,436.58 km) |
| Duzce to Orly | 1,501.36 mi (2,416.21 km) |
| Duzce to Ormesson-sur-Marne | 1,495.38 mi (2,406.58 km) |
| Duzce to Orsay | 1,510.00 mi (2,430.12 km) |
