| Donaueschingen to Obernburg am Main | 133.55 mi (214.93 km) |
| Donaueschingen to Obernkirchen | 299.26 mi (481.61 km) |
| Donaueschingen to Oberschleissheim | 142.82 mi (229.85 km) |
| Donaueschingen to Oberstdorf | 90.74 mi (146.03 km) |
| Donaueschingen to Obertraubling | 181.84 mi (292.64 km) |
| Donaueschingen to Obertshausen | 146.80 mi (236.25 km) |
| Donaueschingen to Oberursel | 155.51 mi (250.27 km) |
| Donaueschingen to Ochsenfurt | 137.14 mi (220.70 km) |
| Donaueschingen to Ochsenhausen | 67.28 mi (108.28 km) |
| Donaueschingen to Ochtrup | 299.52 mi (482.03 km) |
| Donaueschingen to Odenthal | 221.72 mi (356.83 km) |
| Donaueschingen to Oelde | 268.56 mi (432.20 km) |
| Donaueschingen to Oelsnitz | 237.32 mi (381.92 km) |
| Donaueschingen to Oer-Erkenschwick | 260.93 mi (419.93 km) |
| Donaueschingen to Oerlinghausen | 277.41 mi (446.44 km) |
