| Hadamar to Oestrich-Winkel | 31.17 mi (50.16 km) |
| Hadamar to Offenburg | 137.13 mi (220.69 km) |
| Hadamar to Oftersheim | 78.28 mi (125.98 km) |
| Hadamar to Ohrdruf | 120.42 mi (193.79 km) |
| Hadamar to Ohringen | 107.87 mi (173.60 km) |
| Hadamar to Olbernhau | 232.34 mi (373.92 km) |
| Hadamar to Olching | 213.99 mi (344.38 km) |
| Hadamar to Oldenburg | 186.26 mi (299.76 km) |
| Hadamar to Oldenburg in Holstein | 291.56 mi (469.23 km) |
| Hadamar to Olfen | 92.18 mi (148.35 km) |
| Hadamar to Olpe | 40.29 mi (64.83 km) |
| Hadamar to Olsberg | 64.99 mi (104.59 km) |
| Hadamar to Oranienburg | 273.57 mi (440.27 km) |
| Hadamar to Ortenberg | 44.75 mi (72.01 km) |
| Hadamar to Oschatz | 228.13 mi (367.14 km) |
