| Mountain Top to Oerlinghausen | 3,855.56 mi (6,204.93 km) |
| Mountain Top to Oestrich-Winkel | 3,887.59 mi (6,256.47 km) |
| Mountain Top to Offenburg | 3,931.68 mi (6,327.43 km) |
| Mountain Top to Oftersheim | 3,930.21 mi (6,325.06 km) |
| Mountain Top to Ohrdruf | 3,970.06 mi (6,389.19 km) |
| Mountain Top to Ohringen | 3,972.34 mi (6,392.87 km) |
| Mountain Top to Olbernhau | 4,075.89 mi (6,559.52 km) |
| Mountain Top to Olching | 4,077.88 mi (6,562.71 km) |
| Mountain Top to Oldenburg | 3,804.56 mi (6,122.86 km) |
| Mountain Top to Oldenburg in Holstein | 3,870.87 mi (6,229.57 km) |
| Mountain Top to Olfen | 3,812.98 mi (6,136.40 km) |
| Mountain Top to Olpe | 3,850.83 mi (6,197.30 km) |
| Mountain Top to Olsberg | 3,866.52 mi (6,222.57 km) |
| Mountain Top to Oranienburg | 4,004.69 mi (6,444.92 km) |
| Mountain Top to Ortenberg | 3,918.80 mi (6,306.70 km) |
