| Gheorgheni to Oerlinghausen | 841.01 mi (1,353.47 km) |
| Gheorgheni to Oestrich-Winkel | 836.51 mi (1,346.24 km) |
| Gheorgheni to Offenburg | 829.62 mi (1,335.15 km) |
| Gheorgheni to Oftersheim | 804.69 mi (1,295.03 km) |
| Gheorgheni to Ohrdruf | 732.00 mi (1,178.04 km) |
| Gheorgheni to Ohringen | 762.34 mi (1,226.86 km) |
| Gheorgheni to Olbernhau | 620.94 mi (999.30 km) |
| Gheorgheni to Olching | 673.55 mi (1,083.98 km) |
| Gheorgheni to Oldenburg | 887.84 mi (1,428.85 km) |
| Gheorgheni to Oldenburg in Holstein | 828.98 mi (1,334.11 km) |
| Gheorgheni to Olfen | 888.21 mi (1,429.44 km) |
| Gheorgheni to Olpe | 857.29 mi (1,379.68 km) |
| Gheorgheni to Olsberg | 835.83 mi (1,345.14 km) |
| Gheorgheni to Oranienburg | 689.91 mi (1,110.31 km) |
| Gheorgheni to Ortenberg | 795.07 mi (1,279.54 km) |
