| Covasna to Oerlinghausen | 897.67 mi (1,444.66 km) |
| Covasna to Oestrich-Winkel | 886.82 mi (1,427.19 km) |
| Covasna to Offenburg | 874.14 mi (1,406.79 km) |
| Covasna to Oftersheim | 852.93 mi (1,372.66 km) |
| Covasna to Ohrdruf | 786.64 mi (1,265.97 km) |
| Covasna to Ohringen | 810.25 mi (1,303.98 km) |
| Covasna to Olbernhau | 677.14 mi (1,089.75 km) |
| Covasna to Olching | 717.66 mi (1,154.96 km) |
| Covasna to Oldenburg | 947.03 mi (1,524.09 km) |
| Covasna to Oldenburg in Holstein | 891.81 mi (1,435.23 km) |
| Covasna to Olfen | 943.50 mi (1,518.42 km) |
| Covasna to Olpe | 910.81 mi (1,465.81 km) |
| Covasna to Olsberg | 890.68 mi (1,433.42 km) |
| Covasna to Oranienburg | 751.69 mi (1,209.73 km) |
| Covasna to Ortenberg | 847.09 mi (1,363.26 km) |
