| Civitavecchia to Oegstgeest | 776.33 mi (1,249.38 km) |
| Civitavecchia to Oirschot | 717.88 mi (1,155.31 km) |
| Civitavecchia to Oisterwijk | 724.97 mi (1,166.73 km) |
| Civitavecchia to Oldebroek | 766.10 mi (1,232.92 km) |
| Civitavecchia to Oldenzaal | 741.51 mi (1,193.35 km) |
| Civitavecchia to Ommen | 762.10 mi (1,226.47 km) |
| Civitavecchia to Oosterend | 798.76 mi (1,285.49 km) |
| Civitavecchia to Oosterhout | 735.63 mi (1,183.88 km) |
| Civitavecchia to Oosterwolde | 794.51 mi (1,278.63 km) |
| Civitavecchia to Oostzaan | 783.29 mi (1,260.59 km) |
| Civitavecchia to Opmeer | 798.51 mi (1,285.08 km) |
| Civitavecchia to Oss | 730.07 mi (1,174.94 km) |
| Civitavecchia to Oud-Beijerland | 755.72 mi (1,216.22 km) |
| Civitavecchia to Oudenbosch | 739.47 mi (1,190.07 km) |
| Civitavecchia to Oudewater | 758.10 mi (1,220.04 km) |
