| Overlea to Oerlinghausen | 3,962.26 mi (6,376.64 km) |
| Overlea to Oestrich-Winkel | 3,991.41 mi (6,423.56 km) |
| Overlea to Offenburg | 4,033.35 mi (6,491.06 km) |
| Overlea to Oftersheim | 4,033.42 mi (6,491.16 km) |
| Overlea to Ohrdruf | 4,076.08 mi (6,559.81 km) |
| Overlea to Ohringen | 4,075.72 mi (6,559.24 km) |
| Overlea to Olbernhau | 4,182.76 mi (6,731.50 km) |
| Overlea to Olching | 4,180.75 mi (6,728.26 km) |
| Overlea to Oldenburg | 3,912.62 mi (6,296.76 km) |
| Overlea to Oldenburg in Holstein | 3,981.21 mi (6,407.13 km) |
| Overlea to Olfen | 3,918.88 mi (6,306.83 km) |
| Overlea to Olpe | 3,955.96 mi (6,366.50 km) |
| Overlea to Olsberg | 3,972.35 mi (6,392.88 km) |
| Overlea to Oranienburg | 4,113.99 mi (6,620.84 km) |
| Overlea to Ortenberg | 4,023.54 mi (6,475.25 km) |
