| Ariano Irpino to Oberkirch | 614.09 mi (988.29 km) |
| Ariano Irpino to Obernburg am Main | 665.25 mi (1,070.61 km) |
| Ariano Irpino to Obernkirchen | 817.63 mi (1,315.85 km) |
| Ariano Irpino to Oberschleissheim | 519.83 mi (836.59 km) |
| Ariano Irpino to Oberstdorf | 493.22 mi (793.75 km) |
| Ariano Irpino to Obertraubling | 558.23 mi (898.38 km) |
| Ariano Irpino to Obertshausen | 685.52 mi (1,103.23 km) |
| Ariano Irpino to Oberursel | 699.25 mi (1,125.34 km) |
| Ariano Irpino to Ochsenfurt | 635.28 mi (1,022.39 km) |
| Ariano Irpino to Ochsenhausen | 540.53 mi (869.90 km) |
| Ariano Irpino to Ochtrup | 849.33 mi (1,366.87 km) |
| Ariano Irpino to Odenthal | 781.22 mi (1,257.25 km) |
| Ariano Irpino to Oelde | 807.51 mi (1,299.56 km) |
| Ariano Irpino to Oelsnitz | 655.24 mi (1,054.50 km) |
| Ariano Irpino to Oer-Erkenschwick | 814.22 mi (1,310.36 km) |
