| Civitavecchia to Oberkirch | 479.63 mi (771.88 km) |
| Civitavecchia to Obernburg am Main | 549.71 mi (884.68 km) |
| Civitavecchia to Obernkirchen | 713.50 mi (1,148.27 km) |
| Civitavecchia to Oberschleissheim | 425.08 mi (684.09 km) |
| Civitavecchia to Oberstdorf | 374.35 mi (602.47 km) |
| Civitavecchia to Obertraubling | 474.71 mi (763.97 km) |
| Civitavecchia to Obertshausen | 568.39 mi (914.73 km) |
| Civitavecchia to Oberursel | 580.60 mi (934.39 km) |
| Civitavecchia to Ochsenfurt | 528.24 mi (850.11 km) |
| Civitavecchia to Ochsenhausen | 422.38 mi (679.75 km) |
| Civitavecchia to Ochtrup | 730.67 mi (1,175.90 km) |
| Civitavecchia to Odenthal | 655.76 mi (1,055.34 km) |
| Civitavecchia to Oelde | 693.95 mi (1,116.80 km) |
| Civitavecchia to Oelsnitz | 574.89 mi (925.20 km) |
| Civitavecchia to Oer-Erkenschwick | 693.09 mi (1,115.41 km) |
