| Treia to Oberkirch | 439.49 mi (707.29 km) |
| Treia to Obernburg am Main | 492.48 mi (792.57 km) |
| Treia to Obernkirchen | 648.37 mi (1,043.45 km) |
| Treia to Oberschleissheim | 351.42 mi (565.56 km) |
| Treia to Oberstdorf | 319.12 mi (513.57 km) |
| Treia to Obertraubling | 394.50 mi (634.89 km) |
| Treia to Obertshausen | 512.53 mi (824.84 km) |
| Treia to Oberursel | 526.05 mi (846.60 km) |
| Treia to Ochsenfurt | 464.28 mi (747.18 km) |
| Treia to Ochsenhausen | 366.76 mi (590.24 km) |
| Treia to Ochtrup | 676.56 mi (1,088.81 km) |
| Treia to Odenthal | 607.24 mi (977.26 km) |
| Treia to Oelde | 635.69 mi (1,023.05 km) |
| Treia to Oelsnitz | 493.89 mi (794.84 km) |
| Treia to Oer-Erkenschwick | 640.92 mi (1,031.46 km) |
