| Grenchen to Oberkirch | 98.08 mi (157.85 km) |
| Grenchen to Obernburg am Main | 199.71 mi (321.40 km) |
| Grenchen to Obernkirchen | 359.00 mi (577.76 km) |
| Grenchen to Oberschleissheim | 207.17 mi (333.41 km) |
| Grenchen to Oberstdorf | 135.91 mi (218.73 km) |
| Grenchen to Obertraubling | 252.00 mi (405.56 km) |
| Grenchen to Obertshausen | 209.26 mi (336.77 km) |
| Grenchen to Oberursel | 215.00 mi (346.01 km) |
| Grenchen to Ochsenfurt | 209.42 mi (337.03 km) |
| Grenchen to Ochsenhausen | 133.51 mi (214.86 km) |
| Grenchen to Ochtrup | 346.62 mi (557.84 km) |
| Grenchen to Odenthal | 265.81 mi (427.77 km) |
| Grenchen to Oelde | 322.55 mi (519.10 km) |
| Grenchen to Oelsnitz | 311.02 mi (500.54 km) |
| Grenchen to Oer-Erkenschwick | 307.65 mi (495.11 km) |
