| Montabaur to Oestrich-Winkel | 31.19 mi (50.20 km) |
| Montabaur to Offenburg | 136.25 mi (219.28 km) |
| Montabaur to Oftersheim | 81.08 mi (130.49 km) |
| Montabaur to Ohrdruf | 130.22 mi (209.56 km) |
| Montabaur to Ohringen | 113.49 mi (182.64 km) |
| Montabaur to Olbernhau | 242.24 mi (389.85 km) |
| Montabaur to Olching | 220.45 mi (354.78 km) |
| Montabaur to Oldenburg | 187.73 mi (302.12 km) |
| Montabaur to Oldenburg in Holstein | 296.34 mi (476.91 km) |
| Montabaur to Olfen | 90.45 mi (145.56 km) |
| Montabaur to Olpe | 40.02 mi (64.41 km) |
| Montabaur to Olsberg | 69.25 mi (111.45 km) |
| Montabaur to Oranienburg | 281.96 mi (453.76 km) |
| Montabaur to Ortenberg | 54.45 mi (87.62 km) |
| Montabaur to Oschatz | 237.82 mi (382.74 km) |
