| Middle River to Oerlinghausen | 3,959.64 mi (6,372.43 km) |
| Middle River to Oestrich-Winkel | 3,988.62 mi (6,419.06 km) |
| Middle River to Offenburg | 4,030.44 mi (6,486.36 km) |
| Middle River to Oftersheim | 4,030.59 mi (6,486.60 km) |
| Middle River to Ohrdruf | 4,073.41 mi (6,555.53 km) |
| Middle River to Ohringen | 4,072.90 mi (6,554.70 km) |
| Middle River to Olbernhau | 4,180.15 mi (6,727.30 km) |
| Middle River to Olching | 4,177.89 mi (6,723.67 km) |
| Middle River to Oldenburg | 3,910.09 mi (6,292.69 km) |
| Middle River to Oldenburg in Holstein | 3,978.84 mi (6,403.32 km) |
| Middle River to Olfen | 3,916.21 mi (6,302.54 km) |
| Middle River to Olpe | 3,953.24 mi (6,362.13 km) |
| Middle River to Olsberg | 3,969.67 mi (6,388.57 km) |
| Middle River to Oranienburg | 4,111.55 mi (6,616.90 km) |
| Middle River to Ortenberg | 4,020.79 mi (6,470.84 km) |
