| Montabaur to Obernburg am Main | 71.40 mi (114.91 km) |
| Montabaur to Obernkirchen | 138.11 mi (222.27 km) |
| Montabaur to Oberschleissheim | 226.23 mi (364.08 km) |
| Montabaur to Oberstdorf | 236.97 mi (381.37 km) |
| Montabaur to Obertraubling | 218.98 mi (352.41 km) |
| Montabaur to Obertshausen | 51.36 mi (82.65 km) |
| Montabaur to Oberursel | 36.88 mi (59.34 km) |
| Montabaur to Ochsenfurt | 113.34 mi (182.40 km) |
| Montabaur to Ochsenhausen | 189.37 mi (304.76 km) |
| Montabaur to Ochtrup | 125.21 mi (201.50 km) |
| Montabaur to Odenthal | 51.54 mi (82.94 km) |
| Montabaur to Oelde | 97.46 mi (156.85 km) |
| Montabaur to Oelsnitz | 191.05 mi (307.46 km) |
| Montabaur to Oer-Erkenschwick | 86.90 mi (139.86 km) |
| Montabaur to Oerlinghausen | 111.75 mi (179.85 km) |
