| Ortahisar to Oerlinghausen | 1,558.06 mi (2,507.45 km) |
| Ortahisar to Oestrich-Winkel | 1,531.02 mi (2,463.93 km) |
| Ortahisar to Offenburg | 1,499.79 mi (2,413.67 km) |
| Ortahisar to Oftersheim | 1,491.44 mi (2,400.24 km) |
| Ortahisar to Ohrdruf | 1,443.43 mi (2,322.98 km) |
| Ortahisar to Ohringen | 1,448.66 mi (2,331.40 km) |
| Ortahisar to Olbernhau | 1,338.02 mi (2,153.33 km) |
| Ortahisar to Olching | 1,346.73 mi (2,167.36 km) |
| Ortahisar to Oldenburg | 1,611.75 mi (2,593.87 km) |
| Ortahisar to Oldenburg in Holstein | 1,559.20 mi (2,509.29 km) |
| Ortahisar to Olfen | 1,600.58 mi (2,575.89 km) |
| Ortahisar to Olpe | 1,563.73 mi (2,516.58 km) |
| Ortahisar to Olsberg | 1,547.09 mi (2,489.80 km) |
| Ortahisar to Oranienburg | 1,419.05 mi (2,283.75 km) |
| Ortahisar to Ortenberg | 1,496.74 mi (2,408.77 km) |
