| Drogheda to Oberkirch | 719.25 mi (1,157.52 km) |
| Drogheda to Obernburg am Main | 712.58 mi (1,146.78 km) |
| Drogheda to Obernkirchen | 649.81 mi (1,045.77 km) |
| Drogheda to Oberschleissheim | 862.88 mi (1,388.68 km) |
| Drogheda to Oberstdorf | 847.06 mi (1,363.21 km) |
| Drogheda to Obertraubling | 860.89 mi (1,385.47 km) |
| Drogheda to Obertshausen | 693.19 mi (1,115.58 km) |
| Drogheda to Oberursel | 678.79 mi (1,092.41 km) |
| Drogheda to Ochsenfurt | 755.21 mi (1,215.40 km) |
| Drogheda to Ochsenhausen | 807.69 mi (1,299.86 km) |
| Drogheda to Ochtrup | 572.29 mi (921.01 km) |
| Drogheda to Odenthal | 596.52 mi (960.01 km) |
| Drogheda to Oelde | 618.80 mi (995.86 km) |
| Drogheda to Oelsnitz | 816.29 mi (1,313.69 km) |
| Drogheda to Oer-Erkenschwick | 586.56 mi (943.98 km) |
