| Koper to Oberkirch | 336.39 mi (541.37 km) |
| Koper to Obernburg am Main | 365.17 mi (587.69 km) |
| Koper to Obernkirchen | 508.94 mi (819.06 km) |
| Koper to Oberschleissheim | 212.73 mi (342.36 km) |
| Koper to Oberstdorf | 208.58 mi (335.67 km) |
| Koper to Obertraubling | 247.16 mi (397.77 km) |
| Koper to Obertshausen | 385.94 mi (621.11 km) |
| Koper to Oberursel | 400.38 mi (644.35 km) |
| Koper to Ochsenfurt | 330.71 mi (532.22 km) |
| Koper to Ochsenhausen | 249.76 mi (401.95 km) |
| Koper to Ochtrup | 547.10 mi (880.48 km) |
| Koper to Odenthal | 485.45 mi (781.25 km) |
| Koper to Oelde | 502.96 mi (809.44 km) |
| Koper to Oelsnitz | 343.95 mi (553.54 km) |
| Koper to Oer-Erkenschwick | 514.27 mi (827.64 km) |
