| Civitavecchia to Oerlinghausen | 697.33 mi (1,122.25 km) |
| Civitavecchia to Oestrich-Winkel | 575.25 mi (925.78 km) |
| Civitavecchia to Offenburg | 478.21 mi (769.61 km) |
| Civitavecchia to Oftersheim | 525.61 mi (845.88 km) |
| Civitavecchia to Ohrdruf | 605.17 mi (973.93 km) |
| Civitavecchia to Ohringen | 502.92 mi (809.37 km) |
| Civitavecchia to Olbernhau | 596.36 mi (959.75 km) |
| Civitavecchia to Olching | 422.12 mi (679.34 km) |
| Civitavecchia to Oldenburg | 780.86 mi (1,256.68 km) |
| Civitavecchia to Oldenburg in Holstein | 843.98 mi (1,358.25 km) |
| Civitavecchia to Olfen | 696.05 mi (1,120.19 km) |
| Civitavecchia to Olpe | 644.02 mi (1,036.44 km) |
| Civitavecchia to Olsberg | 657.95 mi (1,058.88 km) |
| Civitavecchia to Oranienburg | 739.17 mi (1,189.57 km) |
| Civitavecchia to Ortenberg | 585.20 mi (941.79 km) |
