| Castleton to Oberkirch | 565.19 mi (909.59 km) |
| Castleton to Obernburg am Main | 548.47 mi (882.68 km) |
| Castleton to Obernkirchen | 478.57 mi (770.19 km) |
| Castleton to Oberschleissheim | 701.34 mi (1,128.69 km) |
| Castleton to Oberstdorf | 692.56 mi (1,114.56 km) |
| Castleton to Obertraubling | 695.61 mi (1,119.47 km) |
| Castleton to Obertshausen | 528.55 mi (850.62 km) |
| Castleton to Oberursel | 513.94 mi (827.10 km) |
| Castleton to Ochsenfurt | 590.41 mi (950.17 km) |
| Castleton to Ochsenhausen | 650.69 mi (1,047.18 km) |
| Castleton to Ochtrup | 401.52 mi (646.19 km) |
| Castleton to Odenthal | 429.96 mi (691.95 km) |
| Castleton to Oelde | 448.41 mi (721.65 km) |
| Castleton to Oelsnitz | 646.82 mi (1,040.96 km) |
| Castleton to Oer-Erkenschwick | 417.27 mi (671.54 km) |
