| Duzce to Oberkirch | 1,245.39 mi (2,004.27 km) |
| Duzce to Obernburg am Main | 1,230.08 mi (1,979.63 km) |
| Duzce to Obernkirchen | 1,302.62 mi (2,096.36 km) |
| Duzce to Oberschleissheim | 1,087.73 mi (1,750.54 km) |
| Duzce to Oberstdorf | 1,126.05 mi (1,812.20 km) |
| Duzce to Obertraubling | 1,081.28 mi (1,740.15 km) |
| Duzce to Obertshausen | 1,248.66 mi (2,009.52 km) |
| Duzce to Oberursel | 1,262.73 mi (2,032.17 km) |
| Duzce to Ochsenfurt | 1,186.88 mi (1,910.11 km) |
| Duzce to Ochsenhausen | 1,154.10 mi (1,857.35 km) |
| Duzce to Ochtrup | 1,373.43 mi (2,210.33 km) |
| Duzce to Odenthal | 1,343.65 mi (2,162.40 km) |
| Duzce to Oelde | 1,325.52 mi (2,133.22 km) |
| Duzce to Oelsnitz | 1,125.89 mi (1,811.94 km) |
| Duzce to Oer-Erkenschwick | 1,354.85 mi (2,180.41 km) |
