| Hadamar to Obernburg am Main | 64.12 mi (103.19 km) |
| Hadamar to Obernkirchen | 133.69 mi (215.15 km) |
| Hadamar to Oberschleissheim | 219.41 mi (353.10 km) |
| Hadamar to Oberstdorf | 233.14 mi (375.20 km) |
| Hadamar to Obertraubling | 210.56 mi (338.86 km) |
| Hadamar to Obertshausen | 43.57 mi (70.12 km) |
| Hadamar to Oberursel | 28.82 mi (46.38 km) |
| Hadamar to Ochsenfurt | 105.16 mi (169.25 km) |
| Hadamar to Ochsenhausen | 185.23 mi (298.10 km) |
| Hadamar to Ochtrup | 126.85 mi (204.14 km) |
| Hadamar to Odenthal | 57.35 mi (92.30 km) |
| Hadamar to Oelde | 95.67 mi (153.97 km) |
| Hadamar to Oelsnitz | 181.17 mi (291.57 km) |
| Hadamar to Oer-Erkenschwick | 89.39 mi (143.86 km) |
| Hadamar to Oerlinghausen | 108.14 mi (174.03 km) |
