| Odorheiu Secuiesc to Oerlinghausen | 844.61 mi (1,359.27 km) |
| Odorheiu Secuiesc to Oestrich-Winkel | 834.92 mi (1,343.67 km) |
| Odorheiu Secuiesc to Offenburg | 824.05 mi (1,326.19 km) |
| Odorheiu Secuiesc to Oftersheim | 801.61 mi (1,290.06 km) |
| Odorheiu Secuiesc to Ohrdruf | 733.80 mi (1,180.94 km) |
| Odorheiu Secuiesc to Ohringen | 759.01 mi (1,221.51 km) |
| Odorheiu Secuiesc to Olbernhau | 624.10 mi (1,004.39 km) |
| Odorheiu Secuiesc to Olching | 667.65 mi (1,074.47 km) |
| Odorheiu Secuiesc to Oldenburg | 893.90 mi (1,438.59 km) |
| Odorheiu Secuiesc to Oldenburg in Holstein | 839.35 mi (1,350.81 km) |
| Odorheiu Secuiesc to Olfen | 890.60 mi (1,433.28 km) |
| Odorheiu Secuiesc to Olpe | 858.19 mi (1,381.12 km) |
| Odorheiu Secuiesc to Olsberg | 837.83 mi (1,348.36 km) |
| Odorheiu Secuiesc to Oranienburg | 698.93 mi (1,124.81 km) |
| Odorheiu Secuiesc to Ortenberg | 794.76 mi (1,279.05 km) |
