| Drogheda to Oerlinghausen | 637.08 mi (1,025.28 km) |
| Drogheda to Oestrich-Winkel | 662.59 mi (1,066.33 km) |
| Drogheda to Offenburg | 716.33 mi (1,152.82 km) |
| Drogheda to Oftersheim | 706.77 mi (1,137.44 km) |
| Drogheda to Ohrdruf | 747.33 mi (1,202.71 km) |
| Drogheda to Ohringen | 748.26 mi (1,204.21 km) |
| Drogheda to Olbernhau | 856.95 mi (1,379.13 km) |
| Drogheda to Olching | 855.09 mi (1,376.14 km) |
| Drogheda to Oldenburg | 599.89 mi (965.43 km) |
| Drogheda to Oldenburg in Holstein | 699.27 mi (1,125.37 km) |
| Drogheda to Olfen | 590.23 mi (949.88 km) |
| Drogheda to Olpe | 625.62 mi (1,006.84 km) |
| Drogheda to Olsberg | 643.28 mi (1,035.26 km) |
| Drogheda to Oranienburg | 810.24 mi (1,303.96 km) |
| Drogheda to Ortenberg | 693.13 mi (1,115.48 km) |
