| Donaueschingen to Oestrich-Winkel | 143.26 mi (230.55 km) |
| Donaueschingen to Offenburg | 44.14 mi (71.03 km) |
| Donaueschingen to Oftersheim | 98.01 mi (157.73 km) |
| Donaueschingen to Ohrdruf | 222.49 mi (358.06 km) |
| Donaueschingen to Ohringen | 97.46 mi (156.84 km) |
| Donaueschingen to Olbernhau | 287.11 mi (462.06 km) |
| Donaueschingen to Olching | 130.99 mi (210.80 km) |
| Donaueschingen to Oldenburg | 358.87 mi (577.55 km) |
| Donaueschingen to Oldenburg in Holstein | 450.44 mi (724.91 km) |
| Donaueschingen to Olfen | 264.78 mi (426.12 km) |
| Donaueschingen to Olpe | 213.80 mi (344.07 km) |
| Donaueschingen to Olsberg | 234.70 mi (377.72 km) |
| Donaueschingen to Oranienburg | 391.72 mi (630.41 km) |
| Donaueschingen to Ortenberg | 167.87 mi (270.16 km) |
| Donaueschingen to Oschatz | 309.63 mi (498.29 km) |
