| Trier to Oberkirch | 106.73 mi (171.77 km) |
| Trier to Obernburg am Main | 111.64 mi (179.67 km) |
| Trier to Obernkirchen | 204.07 mi (328.43 km) |
| Trier to Oberschleissheim | 246.26 mi (396.32 km) |
| Trier to Oberstdorf | 232.21 mi (373.70 km) |
| Trier to Obertraubling | 254.52 mi (409.60 km) |
| Trier to Obertshausen | 99.85 mi (160.69 km) |
| Trier to Oberursel | 91.36 mi (147.03 km) |
| Trier to Ochsenfurt | 153.23 mi (246.59 km) |
| Trier to Ochsenhausen | 189.94 mi (305.69 km) |
| Trier to Ochtrup | 170.88 mi (275.00 km) |
| Trier to Odenthal | 90.65 mi (145.89 km) |
| Trier to Oelde | 157.87 mi (254.08 km) |
| Trier to Oelsnitz | 249.10 mi (400.88 km) |
| Trier to Oer-Erkenschwick | 132.98 mi (214.00 km) |
