| Irmo to Oberkirch | 4,471.77 mi (7,196.62 km) |
| Irmo to Obernburg am Main | 4,479.14 mi (7,208.49 km) |
| Irmo to Obernkirchen | 4,411.98 mi (7,100.39 km) |
| Irmo to Oberschleissheim | 4,625.02 mi (7,443.24 km) |
| Irmo to Oberstdorf | 4,596.45 mi (7,397.27 km) |
| Irmo to Obertraubling | 4,627.95 mi (7,447.96 km) |
| Irmo to Obertshausen | 4,460.31 mi (7,178.18 km) |
| Irmo to Oberursel | 4,446.14 mi (7,155.38 km) |
| Irmo to Ochsenfurt | 4,522.21 mi (7,277.80 km) |
| Irmo to Ochsenhausen | 4,562.99 mi (7,343.42 km) |
| Irmo to Ochtrup | 4,337.98 mi (6,981.31 km) |
| Irmo to Odenthal | 4,365.00 mi (7,024.79 km) |
| Irmo to Oelde | 4,385.43 mi (7,057.67 km) |
| Irmo to Oelsnitz | 4,584.30 mi (7,377.71 km) |
| Irmo to Oer-Erkenschwick | 4,354.71 mi (7,008.23 km) |
