| Idrija to Oberkirch | 328.86 mi (529.25 km) |
| Idrija to Obernburg am Main | 348.40 mi (560.69 km) |
| Idrija to Obernkirchen | 486.12 mi (782.33 km) |
| Idrija to Oberschleissheim | 193.62 mi (311.60 km) |
| Idrija to Oberstdorf | 202.44 mi (325.79 km) |
| Idrija to Obertraubling | 222.40 mi (357.91 km) |
| Idrija to Obertshausen | 369.20 mi (594.17 km) |
| Idrija to Oberursel | 383.84 mi (617.73 km) |
| Idrija to Ochsenfurt | 311.79 mi (501.77 km) |
| Idrija to Ochsenhausen | 239.42 mi (385.31 km) |
| Idrija to Ochtrup | 528.03 mi (849.78 km) |
| Idrija to Odenthal | 469.55 mi (755.67 km) |
| Idrija to Oelde | 482.89 mi (777.13 km) |
| Idrija to Oelsnitz | 316.77 mi (509.79 km) |
| Idrija to Oer-Erkenschwick | 496.42 mi (798.91 km) |
