| Civitavecchia to Opwijk | 710.74 mi (1,143.82 km) |
| Civitavecchia to Ostend | 757.01 mi (1,218.29 km) |
| Civitavecchia to Oud-Heverlee | 691.60 mi (1,113.02 km) |
| Civitavecchia to Oud-Turnhout | 713.29 mi (1,147.93 km) |
| Civitavecchia to Oudenaarde | 718.55 mi (1,156.40 km) |
| Civitavecchia to Oudenburg | 752.57 mi (1,211.14 km) |
| Civitavecchia to Oupeye | 662.62 mi (1,066.38 km) |
| Civitavecchia to Overijse | 691.79 mi (1,113.33 km) |
| Civitavecchia to Overpelt | 698.22 mi (1,123.68 km) |
| Civitavecchia to Paal | 692.56 mi (1,114.57 km) |
| Civitavecchia to Peer | 692.36 mi (1,114.24 km) |
| Civitavecchia to Pepinster | 650.40 mi (1,046.71 km) |
| Civitavecchia to Peruwelz | 700.47 mi (1,127.30 km) |
| Civitavecchia to Perwez | 675.90 mi (1,087.76 km) |
| Civitavecchia to Philippeville | 657.80 mi (1,058.63 km) |
