| Trecate to Oberkirch | 216.37 mi (348.21 km) |
| Trecate to Obernburg am Main | 305.06 mi (490.95 km) |
| Trecate to Obernkirchen | 472.44 mi (760.32 km) |
| Trecate to Oberschleissheim | 236.20 mi (380.12 km) |
| Trecate to Oberstdorf | 155.13 mi (249.66 km) |
| Trecate to Obertraubling | 292.43 mi (470.61 km) |
| Trecate to Obertshausen | 320.17 mi (515.26 km) |
| Trecate to Oberursel | 329.65 mi (530.53 km) |
| Trecate to Ochsenfurt | 297.90 mi (479.42 km) |
| Trecate to Ochsenhausen | 191.18 mi (307.67 km) |
| Trecate to Ochtrup | 473.13 mi (761.42 km) |
| Trecate to Odenthal | 393.98 mi (634.06 km) |
| Trecate to Oelde | 442.99 mi (712.93 km) |
| Trecate to Oelsnitz | 379.14 mi (610.17 km) |
| Trecate to Oer-Erkenschwick | 434.30 mi (698.93 km) |
