| Targu Secuiesc to Oberkirch | 862.44 mi (1,387.96 km) |
| Targu Secuiesc to Obernburg am Main | 828.57 mi (1,333.45 km) |
| Targu Secuiesc to Obernkirchen | 880.03 mi (1,416.28 km) |
| Targu Secuiesc to Oberschleissheim | 701.46 mi (1,128.88 km) |
| Targu Secuiesc to Oberstdorf | 756.52 mi (1,217.50 km) |
| Targu Secuiesc to Obertraubling | 682.83 mi (1,098.91 km) |
| Targu Secuiesc to Obertshausen | 845.33 mi (1,360.42 km) |
| Targu Secuiesc to Oberursel | 858.50 mi (1,381.63 km) |
| Targu Secuiesc to Ochsenfurt | 785.40 mi (1,263.98 km) |
| Targu Secuiesc to Ochsenhausen | 774.36 mi (1,246.22 km) |
| Targu Secuiesc to Ochtrup | 954.72 mi (1,536.47 km) |
| Targu Secuiesc to Odenthal | 934.31 mi (1,503.63 km) |
| Targu Secuiesc to Oelde | 907.72 mi (1,460.83 km) |
| Targu Secuiesc to Oelsnitz | 710.75 mi (1,143.85 km) |
| Targu Secuiesc to Oer-Erkenschwick | 940.16 mi (1,513.04 km) |
