| Istrana to Oberkirch | 272.79 mi (439.01 km) |
| Istrana to Obernburg am Main | 318.32 mi (512.28 km) |
| Istrana to Obernkirchen | 474.42 mi (763.51 km) |
| Istrana to Oberschleissheim | 179.11 mi (288.26 km) |
| Istrana to Oberstdorf | 147.35 mi (237.14 km) |
| Istrana to Obertraubling | 226.82 mi (365.03 km) |
| Istrana to Obertshausen | 338.51 mi (544.78 km) |
| Istrana to Oberursel | 352.21 mi (566.83 km) |
| Istrana to Ochsenfurt | 289.91 mi (466.57 km) |
| Istrana to Ochsenhausen | 193.82 mi (311.92 km) |
| Istrana to Ochtrup | 502.43 mi (808.59 km) |
| Istrana to Odenthal | 434.49 mi (699.25 km) |
| Istrana to Oelde | 461.27 mi (742.34 km) |
| Istrana to Oelsnitz | 327.06 mi (526.35 km) |
| Istrana to Oer-Erkenschwick | 467.18 mi (751.85 km) |
