| Castellana Grotte to Oberkirch | 690.62 mi (1,111.44 km) |
| Castellana Grotte to Obernburg am Main | 730.33 mi (1,175.35 km) |
| Castellana Grotte to Obernkirchen | 873.21 mi (1,405.29 km) |
| Castellana Grotte to Oberschleissheim | 578.46 mi (930.94 km) |
| Castellana Grotte to Oberstdorf | 565.15 mi (909.52 km) |
| Castellana Grotte to Obertraubling | 609.32 mi (980.61 km) |
| Castellana Grotte to Obertshausen | 751.03 mi (1,208.66 km) |
| Castellana Grotte to Oberursel | 765.32 mi (1,231.66 km) |
| Castellana Grotte to Ochsenfurt | 696.48 mi (1,120.87 km) |
| Castellana Grotte to Ochsenhausen | 610.44 mi (982.40 km) |
| Castellana Grotte to Ochtrup | 912.84 mi (1,469.07 km) |
| Castellana Grotte to Odenthal | 849.68 mi (1,367.44 km) |
| Castellana Grotte to Oelde | 868.70 mi (1,398.04 km) |
| Castellana Grotte to Oelsnitz | 701.16 mi (1,128.40 km) |
| Castellana Grotte to Oer-Erkenschwick | 879.68 mi (1,415.70 km) |
