| Ianca to Oberkirch | 943.34 mi (1,518.16 km) |
| Ianca to Obernburg am Main | 912.74 mi (1,468.91 km) |
| Ianca to Obernkirchen | 967.32 mi (1,556.75 km) |
| Ianca to Oberschleissheim | 782.40 mi (1,259.16 km) |
| Ianca to Oberstdorf | 834.34 mi (1,342.74 km) |
| Ianca to Obertraubling | 766.07 mi (1,232.87 km) |
| Ianca to Obertshausen | 929.84 mi (1,496.43 km) |
| Ianca to Oberursel | 943.18 mi (1,517.91 km) |
| Ianca to Ochsenfurt | 869.47 mi (1,399.28 km) |
| Ianca to Ochsenhausen | 854.32 mi (1,374.90 km) |
| Ianca to Ochtrup | 1,041.61 mi (1,676.30 km) |
| Ianca to Odenthal | 1,019.91 mi (1,641.38 km) |
| Ianca to Oelde | 994.46 mi (1,600.44 km) |
| Ianca to Oelsnitz | 796.93 mi (1,282.53 km) |
| Ianca to Oer-Erkenschwick | 1,026.53 mi (1,652.03 km) |
