| Black Forest to Oerlinghausen | 4,984.01 mi (8,020.99 km) |
| Black Forest to Oestrich-Winkel | 5,052.35 mi (8,130.97 km) |
| Black Forest to Offenburg | 5,120.54 mi (8,240.71 km) |
| Black Forest to Oftersheim | 5,100.81 mi (8,208.97 km) |
| Black Forest to Ohrdruf | 5,102.82 mi (8,212.20 km) |
| Black Forest to Ohringen | 5,139.24 mi (8,270.81 km) |
| Black Forest to Olbernhau | 5,192.39 mi (8,356.35 km) |
| Black Forest to Olching | 5,246.91 mi (8,444.09 km) |
| Black Forest to Oldenburg | 4,916.13 mi (7,911.74 km) |
| Black Forest to Oldenburg in Holstein | 4,944.59 mi (7,957.55 km) |
| Black Forest to Olfen | 4,954.08 mi (7,972.82 km) |
| Black Forest to Olpe | 5,000.44 mi (8,047.43 km) |
| Black Forest to Olsberg | 5,006.36 mi (8,056.96 km) |
| Black Forest to Oranienburg | 5,088.18 mi (8,188.64 km) |
| Black Forest to Ortenberg | 5,070.76 mi (8,160.60 km) |
