| Mullingar to Oberkirch | 751.45 mi (1,209.35 km) |
| Mullingar to Obernburg am Main | 748.35 mi (1,204.35 km) |
| Mullingar to Obernkirchen | 689.81 mi (1,110.14 km) |
| Mullingar to Oberschleissheim | 897.41 mi (1,444.24 km) |
| Mullingar to Oberstdorf | 879.09 mi (1,414.76 km) |
| Mullingar to Obertraubling | 896.95 mi (1,443.51 km) |
| Mullingar to Obertshausen | 729.21 mi (1,173.54 km) |
| Mullingar to Oberursel | 714.92 mi (1,150.55 km) |
| Mullingar to Ochsenfurt | 791.20 mi (1,273.31 km) |
| Mullingar to Ochsenhausen | 840.67 mi (1,352.92 km) |
| Mullingar to Ochtrup | 611.69 mi (984.42 km) |
| Mullingar to Odenthal | 633.53 mi (1,019.57 km) |
| Mullingar to Oelde | 657.84 mi (1,058.69 km) |
| Mullingar to Oelsnitz | 854.53 mi (1,375.24 km) |
| Mullingar to Oer-Erkenschwick | 624.91 mi (1,005.69 km) |
